# Date Expressions Must Use Integer Or Long

For some of the expressions, there are also actions available. If you are unsure that the size of the source and destination INT or BIGINT you are converting is the same, use CAST to convert these data types to/from binary. A SQL expression may be simple or complex. Data Types in Expressions (Report Builder and SSRS) 08/17/2018; 8 minutes to read +2; In this article. We have already seen one example of a function call: >>> type(32). Therefore, the numbers 10, 0, -25, and 5,148 are all integers. URI Conventions (OData Version 2. let "expression". Otherwise it is computed from midnight of. The enum values must be of the same type as the. Expressions can access project properties and call builtin or user-defined functions. I know this does not answer your question, but why don't you use a date handling routine to check if it's a valid date? Even if you modify the regexp with a negative lookahead assertion like (?!31/0?2) (ie, do not match 31/2 or 31/02) you'll still have the problem of accepting 29 02 on non leap years and about a single separator date format. Summary: in this tutorial, you will learn about variables in the stored procedure, how to declare, and use variables. Excel Formula Training. the string must match the 'YYYY-MM-DD' format. A number can be a flonum or bignum. Working with Bytes To send data back and forth over The Things Network you'll need to use bytes. 21+], this prefix can be used in the InputVar parameters of all commands except the traditional IF commands (use If (expression) instead). The value of id-number must be an expression that evaluates to an even integer value between 2 and 65534, inclusive, and must be unique across all widget IDs in the window or dialog box. In the background Access always stores the date and time you enter like a number. Calculated fields allow you to compare fields, apply aggregations, apply logic, concatenate strings, convert dates or perform a myriad of other analytical and. Note: We can't store decimal values using int data type. 1 Function calls In the context of programming, a function is a named sequence of statements that performs a computation. The type of the interval value must be specified in the expression, using only the interval field names. This necessary so that the compiler knows that the functions exist. We can perform such operations using the pre-defined functions of “string. Applications can chose to store dates and times in any of these formats and freely convert between formats using the built-in date and time functions. A few utilities like awk and egrep use the extended expression. If an integer literal ends with L or l, it is of type long. 1415926535897932384L double 10. The Simple Expression Language was a really simple language when it was created, but has since grown more powerful. Expressions are simple, yet powerful mechanism that allows you to write advanced formulas to be used in task arguments and conditions that direct the build process. The DATEDIF (Date + Dif) function is a "compatibility" function that comes from Lotus 1-2-3. To simplify integer expressions, we follow the order of operations, which is the mathematical rule that tells you in what order to do your operations. puts and some basic programming examples that illustrate the. They are mainly CAST, To_Date and load_to_XML. Functions allow you to reuse and encapsulate code. Returns the day of the year (1 to 365 or 366 on leap years) for this date. Example: temperatures[1] The value passed to index is a 32-bit integer that is either 0 or a positive value ranging to one less than the array's length, which is indicated by appending. For radixes above 10, the letters of the alphabet indicate numerals greater than 9. Use int (or unsigned int) for counting and indexing, NOT floating-point type (float or double). a 20million -- 20 times as long. A BLOB is data stored as a long sequence of binary numbers. directly in expressions. The long data type can have values from -2 63 to 2 63-1 (64-bit signed two's complement integer). Today, we'll review eight regular expressions that you should know for your next coding project. We can use the lower case l but few can tell the difference between 12l (12 and L) or 121 (12 and one), so we always use an upper case L. If the SERVICE_STATUS column in Table A is 'NP', then use the effective date for that serial number. It is primarily intended for being a really small and simple language for evaluating Expressions and Predicates without requiring any new dependencies or knowledge of XPath; so it is ideal for testing in camel-core. The length of the array is determined by an integer parameter. This suffix denotes a long integer rather than a standard integer. If you are using Java 8 or later, you can use unsigned 64-bit integer with minimum value of 0 and maximum value of 2 64-1. The Excel DATEDIF function returns the difference between two date values in years, months, or days. For this reason, SQL expressions are commonly known as value expressions. Select a function name to go to a full description of the function with examples of use. case constant-expression: where constant-expression must be an int and must be unique. It is only the formatting of an Excel cell that causes its contents to be displayed as a date, rather than an integer. If a Date is specified, the time part is set to 00:00:00 (12:00:00 AM). The expr is an expression specifying the interval value to be added or subtracted from the starting date. You cannot use a symbolic constant or variable to specify the maximum size; you must use an integer literal in the range 1. When you enter date fields in the table through ArcGIS, they are converted to this format. Integer input. You can convert values from one type to another explicitly using the cast operator. Pat (BMath/CS) helped create VB 1. h file in your C program. The body consists of a multiply operator to the same parameter expression. Practically, it is the same as operations and expressions in simple arithmetic. Rule: Use uniform initialization to initialize class objects. Unlike when you use the SYS. Functions that do not return values have a return type of void. Variables and types The usefulness of the "Hello World" programs shown in the previous chapter is rather questionable. Leap years are validated for all 4 digits years from 1600-9999, and all 2 digits years except 00 since it could be any century (1900, 2000, 2100). Example Regexes to Match Common Programming Language Constructs. An integer expression can be composed of a single integer variable or constant or these can be joined by one or more arithmetic operations. This is a more structured way as other ways are simply to cast a float to long or int to get rid of decimal points. Figure J: Convert date values to evaluate date values in simple expressions. Use the example or examples keyword for this purpose instead. There are, however, times when we would like to explicitly create an integer value for a constant. VBA has many functions that help you deal with dates. The two datetime expressions are enclosed in parentheses, followed by the fields. developerforce. However, VBA gives you a better way, the DateAdd function. First up is a discussion of the basic data types that are built into Python. 0, not all platforms support negative timestamps, therefore your date range may be limited to no earlier than the Unix epoch. Returns the day of the year (1 to 365 or 366 on leap years) for this date. Although there are 4 integer types: 8-bit byte, 16-bit short, 32-bit int and 64-bit long, we shall use int for integers in general. In the background Access always stores the date and time you enter like a number. You can nest string functions and use them anywhere an expression is allowed. Introduction to PostgreSQL NUMERIC data type. For example, if A1 contains 6:00pm ( 18:00 hours ) on September 10, 2013 and B1 contains 9:00am ( 9:00 hours ) on December 2, 2013 , we can use NETWORKDAYS to find the number of workdays between the two dates. This includes using numbers written in various bases including decimal, binary, and hexadecimal, as well as the use of the global Math object to perform a wide variety of mathematical operations on numbers. Variables and types The usefulness of the "Hello World" programs shown in the previous chapter is rather questionable. If a String is specified, the date must be written in a format that Spotfire can recognize. multipleOf may be used with floating-point numbers, but in practice this can be unreliable due to the limited precision or floating point math. In order to understand what importance operations and expressions have in MQL4, no special analogies are needed. Use formulas to create smarter forms with Survey123. The %u, %x, and %o format specifiers typically represent unsigned integer conversions. The extract function retrieves subfields such as year or hour from date/time values. Functions that accept a type (such as Column() ) will typically accept a type class or instance; Integer is equivalent to Integer() with no construction arguments in this case. For example, map type is not orderable, so it is not supported. You cannot convert a boolean condition to an integer or string. Supported Argument Types. Integer: An integer is a whole number (not a fraction) that can be positive, negative, or zero. Now you know how to interact with the Python interpreter and execute Python code. If a single argument is used, Arg1 can be of type String or Date. Because a Date/Time value is stored as a double-precision number, you may receive incorrect formatting results when you try to manipulate Date/Time values in an expression. The Integer class is an example of a static class. A reference is a unique integer key. The long data type can have values from -2 63 to 2 63-1 (64-bit signed two's complement integer). If an integer expression involving an operation is compared to or assigned to a larger integer size, that integer expression should be evaluated in that larger size by explicitly casting one of the operands. The argument [](int a, int b) { return abs(a) gid the gid value can be accessed using M['group']. Unlike floating point numbers , integers cannot have decimal places. Of course, the programmer must be aware of the finite limits of the arithemetic data types regardless of which one is chosen. That is what the DATEPART() function does for you. VBA has many functions that help you deal with dates. YEAR: Returns the year component (as an integer) of a date value. The Microsoft Access MonthName function returns a string representing the month given a number from 1 to 12. The C family uses an L or l (ell) after an integer to indicate a long integer. Excel IF AND OR functions on their own aren't very exciting, but mix them up with the IF Statement and you've got yourself a formula that's much more powerful. Define the reference date. int QDate:: daysInMonth const. Use the multipleOf keyword to specify that a number must be the multiple of another number: type: integer multipleOf: 10 The example above matches 10, 20, 30, 0, -10, -20, and so on. Datatype example meaning int i=3; integer long l=3; long integer integer unsigned long ul= 3UL; unsigned long int i=0xA; hexadecimal int i=012; octal number ﬂoat pi=3. Or you can find a time 60 hours earlier than the specified date and time. The toolbox functions support date or date-and-time formats as character vectors, datetime arrays, or serial date numbers. Had I omitted them, the regex engine would go looking for 19 or the remainder of the regular expression, which matches a date between 2000-01-01 and 2099-12-31. Posted in Lists , Office 365 , SharePoint 2010 , SharePoint Online. In today's C programming language tutorial we take a look at how to use time and date from C programs. The type of the interval value must be specified in the expression, using only the interval field names. The aqDateTime and aqConvert objects are available for all supported scripting languages, so that you can use them to operate with date values regardless of the chosen language. 3 Generic names. In addition, we will show you how to use the display width and ZEROFILL attributes of an integer column. The long data type can have values from -2 63 to 2 63-1 (64-bit signed two's complement integer). Enum Parameters You can restrict a parameter to a fixed set of values by adding the enum to the parameter’s schema. WriteLine(now. Function names cannot contain numbers and must not be more than eight characters long. It Returns NULL when month part for the date is 0 or more than 12. newInstance(2008, 1, 1); date dueDate = date. You can also use these and other built-in VBScript functions in your scripts. Although both of these have the same binary format, the address of all FILETIME structures must begin on a 32 bit boundary whereas the address of all LARGE_INTEGER must begin on 64 bit boundary. For full details and examples of how to use the functions, please refer to the Function details by name and Function details by type tabs. If formatIn contains the time of day, the pivot year is computed from the current time of the current day, month, and year. The type of the interval value must be specified in the expression, using only the interval field names. Chapter 3 Assembly Language Fundamentals Objectives After reading this Chapter, you should be able to understand or do each of the following: • Know how to represent integer constants, expressions, real number constants, character constants, and string constants in assembly language. Dates in Strings. ) Prior to PHP 5. Unlike floating point numbers , integers cannot have decimal places. In this case you can use the Str or CStr functions. The type int should be the integer type that the target processor is most efficiently working with. Thus 12L is used for a long integer. If we use int data type to store decimal values, decimal values will be truncated and we will get only whole number. In the background Access always stores the date and time you enter like a number. com/t5/Apex-Code-Development/bd-p/apex This forum is not really for. In both C and Python, casting from float to int is very much a conversion. Create a function that returns timestamp and use the value while setting the content value for date column. The value of id-number must be an expression that evaluates to an even integer value between 2 and 65534, inclusive, and must be unique across all widget IDs in the window or dialog box. They are signed integers in 2's complement representation, and can hold an integer value of the various ranges as shown in the table. Dim now As DateTime = DateTime. Formulas are the key to getting things done in Excel. For 8-byte whole numbers, use host variables of the C data types bigint or int8. The Date/Time data type. Date And Time. You cannot convert a boolean condition to an integer or string. The type of the interval value must be specified in the expression, using only the interval field names. Use an integer. The default format in which the information is presented is mm/dd/yyyy hh:mm:ss and a specification of AM or PM. Question: 228. compile() function to ignore whitespace and comments inside the regular expression string. SAT test makers like to ask questions about even and odd integers. Later, you can "call" the function by name. Returns the date that is the indicated number of months before or after the start date. This chapter introduces the concepts, objects and functions used to work with and perform calculations using numbers and dates in JavaScript. Use the multipleOf keyword to specify that a number must be the multiple of another number: type: integer multipleOf: 10 The example above matches 10, 20, 30, 0, -10, -20, and so on. If you just need to store whole numbers, such as 12 or 12,345,678, specify a short or long integer. Although there are 4 integer types: 8-bit byte, 16-bit short, 32-bit int and 64-bit long, we shall use int for integers in general. However, you might often have tables that do not have a date column, but use an integer or a string column instead. Implicit casting to real is performed when integer columns are used in calculations and the result is a non-integer. Returns 0 if the date is invalid. Use CONVERT when the string format is ambiguous, such as mm/dd/yyyy and dd/mm/yyyy. If you want to subtract dates in Excel, it helps to understand the way that Excel stores dates. The following example expression returns the difference in CPU temperature between now and 2 hours ago: delta(cpu_temp_celsius{host="zeus"}[2h]). To specify multiple holidays, the dates must be held in cells - it is not possible to put multiple DATE functions in an array. 9999999999999999 will become 15120 which is the result you want. , we need to pass the information around by reference. The minimum size for char is 8 bits, the minimum size for short and int is 16 bits, for long it is 32 bits and long long must contain at least 64 bits. This section demonstrates creating such a function. Instead, use the Date methods. These expression operators are available to construct expressions for use in the aggregation pipeline stages. Expressions are calculations that PeopleSoft Query performs as part of a query. MySQL MONTHNAME() returns the full name of the month for a given date. Use built-in functions to display and modify date values. Usually all calculations are done in the appropriate data type: int, long, float, or double. In this example, the combined date/time is in cell A2. The unit for interval is given by the unit argument, which should be one of the following values: MICROSECOND (microseconds), SECOND , MINUTE , HOUR , DAY , WEEK , MONTH , QUARTER , or YEAR. A NULL value is still NULL. Kochan covers the int, float, double, char, and _Bool data types, modifying data types with short, long, and long long, the rules for naming variables, basic math operators and arithmetic expressions, and type casting. Use int (or unsigned int) for counting and indexing, NOT floating-point type (float or double). The Microsoft Access MonthName function returns a string representing the month given a number from 1 to 12. As Fred Brooks observed in The Mythical Man-Month, "Representation is the essence of programming. In general, these expressions take an array of arguments and have the following form:. daysBetween(dueDate); In your case it would be temp_LatestGapLen = temp_PB_CurrSubBeg. It has multiple parts (year, month, day, hour, and so on), and there are many rules about what constitutes a valid date. The expr is a string; it may start with a '-' for negative. Parameter(typeof (int), " x"); The next step is to build the body of lambda expressions which happens to be a binary expression. Had I omitted them, the regex engine would go looking for 19 or the remainder of the regular expression, which matches a date between 2000-01-01 and 2099-12-31. Integer literals are used to initialize variables of integer data types i. (2^31 -1) Default value is : 0; Int is generally used as the default data type for integral values unless there is a concern about memory. You can retrieve an object referred by reference r by calling lua_rawgeti(L, t, r). DATE_ADD(date,INTERVAL expr unit), DATE_SUB(date,INTERVAL expr unit) These functions perform date arithmetic. including Memo, Date/Time, and Text. NET program that uses DateTime string functions Module Module1 Sub Main() ' Use string helper functions. To learn how to use formulas within formulas and more advanced functions, you can try an advanced excel course. Given a date column, returns the first date which is later than the value of the date column that is on the specified day of the week. zA statement must starts with a new line. The type int should be the integer type that the target processor is most efficiently working with. An array s size declarator must be a constant integer expression with a value greater than zero. The date field was written to a file in the SQR date variable format, we could read this field to either a date or string variable. These expression operators are available to construct expressions for use in the aggregation pipeline stages. The Date/Time data type. value_expression can be any data type that can be returned from an expression. The modification may take place in any one of them or in both of them. In many ways you are dependent on others and seem to function best in a partnership or in some form of group activity. Instead, use the Date methods. Use EDATE to calculate maturity dates or due dates that fall on the same day of the month as the date of issue: EOMONTH(, ) Returns the date in datetime format of the last day of the month, before or after a specified number of months. Switch statments offer an alternative to an "else if" structure which has multiple possible paths based on the value of a single expression. Given variable[index], where index must be of integer (int) type, read a value from or store a value into variable's storage element at location index. A filter can be a report object, that is, a report filter, a report limit, or a view filter, that restricts the data returned or the display or view of data on a report. The logic is this: For each sequence number, list the effective dates of each serial number. ) An expression like 10 < 20 is legal but of little use, since the expression true is equivalent, simpler, and less likely to confuse human readers. R and save this file within the R folder in your project. A BLOB is data stored as a long sequence of binary numbers. The default value for numeric data types (such as Byte, Integer, Long, Currency, Single and Double) is 0. The value of expression1 must be less than or equal to the value of expression2. Switch case in C By Alex Allain Switch case statements are a substitute for long if statements that compare a variable to several "integral" values ("integral" values are simply values that can be expressed as an integer, such as the value of a char). Use int (or unsigned int) for counting and indexing, NOT floating-point type (float or double). Figure J: Convert date values to evaluate date values in simple expressions. This tutorial is all about C language data types. There is some ambiguity in the round function because the rounding of Decimal does not work exactly as the SQL standard, and therefore it has been omitted in the current work. This expression validates dates in the ITALIAN d/m/y format from 1/1/1600 - 31/12/9999. The INT function returns just the integer portion of that number, which represents the date. If ‘julian’, unit must be ‘D’, and origin is set to beginning of Julian Calendar. However, you might often have tables that do not have a date column, but use an integer or a string column instead. Typical data types include text (also known as strings), numbers with and without decimal places, dates and times, and images. Functions that accept a type (such as Column()) will typically accept a type class or instance; Integer is equivalent to Integer() with no construction arguments in this ca. Date( ) to convert strings to dates. a character string expression that represents a date. When you declare an integer host variable, you must ensure that this host variable is large enough for all possible values of the SQL integer data type with which the variable is associated. Use byte, short, long and float only if you have a good reason to choose that specific precision. 3 Generic names. You can define functions and use “destructuring assignment” in let expressions too. Correct Answer: J Explanation: Because of the words "must be," the expression given must produce an even number in every instance. However, PointBase will also accept single digits entries for month and day values. While functions, variables, macros, and 25 special operators provide the basic building blocks of the language itself, the building blocks of your programs will be the data structures you use. Defines a variable for use in one or more procedures, a variable data member of a class for use in a single class or class hierarchy, or by other classes and procedures, or a variable data element for use within a single class-based method. Operator expressions are similar to functions that take arguments. A numeric zero value (integer value 0 or real value 0. For best practice use L (not l). Before the conversion can be performed, the input character sequence has to be obtained and stored as a string. No parameters are required when declaring a DATE data type. Enum Parameters You can restrict a parameter to a fixed set of values by adding the enum to the parameter’s schema. Using this function, you can add 14 days, 14 weeks, 14 months, or 14 years to any date. It is best practice to use the suffix L instead of l to avoid confusion with the digit 1 (one) which looks like l in many fonts: 200l ≠ 2001. Formulas are the key to getting things done in Excel. Java has eight primitive types, as listed in the above table: There are four integer types: 8-bit byte, 16-bit short, 32-bit int and 64-bit long. the string must match the 'HH:MI:SS. Other format expressions used with the Format function continue to work as they did in previous versions. If, by mistake, they enter letters or punctuation signs, the conversion into an integer will fail and generate an exception (error) and the program would stop. You use the classname intstead of the object name, e. Select a function name to go to a full description of the function with examples of use. The most common Field Size values are probably Long Integer and Double. When we import data into R, dates and times are usually stored as character or factor by default due to symbols such as "-", ":" and "/". To convert from datetime to date you really just need to divide by one days worth of seconds (24*60*60) and take the integer part. Before we start, you might want to check out some of the regex apps on Envato Market, such as: RegEx Extractor. 2/5), and they cannot easily insert a character if they missed one. If ‘julian’, unit must be ‘D’, and origin is set to beginning of Julian Calendar. It has multiple parts (year, month, day, hour, and so on), and there are many rules about what constitutes a valid date. This section demonstrates creating such a function. Let's look at a function prototype: int mult ( int x, int y ); This prototype specifies that the function mult will accept two arguments, both integers, and that it will return an integer. In SQL, a filter is specified after the WHERE clause. Formats are SAS's method for controlling how to display the values. If the requested price is out of date, but present in the thread, the order will be opened at the current price and only if the current price lies within the range of price+-slippage. Unlike floating point numbers , integers cannot have decimal places. An Integer ByVal x As Integer int x ByRef x As Integer int * x Array of Doubles ByRef x As Double double * x A String ByVal s As String char * s In VBA these functions are referred to by the names test1() to test4() with signatures Function test1(ByVal n As Double, ByRef out As Double) As Double 'a Sub test2(ByVal n As Integer, ByRef out As. Posted in Lists , Office 365 , SharePoint 2010 , SharePoint Online. Set radix to 16 to parse hexadecimal numbers. Applications can chose to store dates and times in any of these formats and freely convert between formats using the built-in date and time functions. Data Types, Arrays and Strings. A Variant is a special kind of data type that can contain different kinds of information, depending on how it's used. The Integer class is an example of a static class. Integer: An integer is a whole number (not a fraction) that can be positive, negative, or zero. Our recommendation for writing nice R code is that in most cases, you should use the second of these options. You cannot mix the two in an expression. This Expression checks if the value is an integer, positive, not zero and not a decimal. , * , #, and parentheses); furthermore, you must quote expressions that include whitespace (spaces or TABs). Functions 2: Void (NonValue-Returning) Functions. printf() function in C language: In C programming language, printf() function is used to print the "character, string, float, integer, octal and hexadecimal values" onto the output screen. No leading zeroes or commas. In AWK, there is a definite difference between a boolean condition, and an arithmetic expression. Datatype example meaning int i=3; integer long l=3; long integer integer unsigned long ul= 3UL; unsigned long int i=0xA; hexadecimal int i=012; octal number ﬂoat pi=3. Conclusion. Date values should be specified in the form: YYYY-MM-DD. C program to store an integer in a string. This chapter introduces the concepts, objects and functions used to work with and perform calculations using numbers and dates in JavaScript. It is based on a currency regular expression by Tom Persing. value_expression can be any data type that can be returned from an expression. must return the same result for every datetime dt with dt. You can define functions and use “destructuring assignment” in let expressions too. Of course, the programmer must be aware of the finite limits of the arithemetic data types regardless of which one is chosen. Functions in the C programming Language. Integer expressions are mathematical expressions with integers or numbers. In the latter case, sequence repetition is performed; a negative repetition factor yields an empty sequence. Functions are always global (not defined in other functions). h header file from the standard C library. The result of the above formula in our worksheet is as follows: As you can see from the examples given, the excel text function is a powerful way of converting numbers and dates to text. It is the abbreviation for timestamp with the time zone. Declaration of variables In order to use a variable in C++, we must first declare it specifying which data type we want it to be. Overview of data types and field properties in Access, and detailed data type reference. The documentation is not very clear, and I have to look into the source codes to understand the salient features. It is used for binding values to expressions with let, and in function parameters, and for branching using the match. Beginning Java: Data types, Variables, and Arrays Learn more about Java with our tutorial Discovering the Differences Between Blocks, Procs and Lambdas on SitePoint. See Adding Examples. Specifies a widget ID for a field or variable widget to display in a frame. In this example, STRING() is used to cast the integer value corpus_date to a string, which is then altered by REGEXP_REPLACE. The %u, %x, and %o format specifiers typically represent unsigned integer conversions. Integer definition, one of the positive or negative numbers 1, 2, 3, etc. Returns the day of the year (1 to 365 or 366 on leap years) for this date. The most popular built-in VBA functions are listed below. RAW and LONG RAW Values. Data Input and Output in C, Part 1 an l or L to indicate a long integer argument and an h to indicate a short integer argument. Error: Integer expression expected, but got "arg1" The compiler expects an expression of type integer, but gets a different type. In this tutorial we're going to take a look at the basics of the AND and OR functions and then put them to work with an IF Statement. Use a(n) ____ loop to execute a body of statements continually as long as the Boolean expression that controls entry into the loop continues to be true. When you select a RAW or LONG RAW column value into a CHAR or VARCHAR2 variable, PL/SQL must convert the. Typical data types include text (also known as strings), numbers with and without decimal places, dates and times, and images. Use the example or examples keyword for this purpose instead. It was issued by the International Organization for Standardization (ISO) and was first published in 1988. To get decimal output. Integer literals are used to initialize variables of integer data types i. You can nest string functions and use them anywhere an expression is allowed. Formulas are the key to getting things done in Excel. When performing field calculations with a Python expression, Python math rules are in effect. Applications can chose to store dates and times in any of these formats and freely convert between formats using the built-in date and time functions. As Fred Brooks observed in The Mythical Man-Month, "Representation is the essence of programming. It's a concise way to represent an anonymous method. Formats are SAS's method for controlling how to display the values. In SQL, a filter is specified after the WHERE clause. C functions must be TYPED (the return type and the type of all parameters specified). For example, the data in a single-dimension array consisting of 4 Integer data elements of 2 bytes each occupies 8 bytes. The unit for interval is given by the unit argument, which should be one of the following values: MICROSECOND (microseconds), SECOND , MINUTE , HOUR , DAY , WEEK , MONTH , QUARTER , or YEAR.