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Inside Microsoft SQL Server 2008: T-SQL Programming
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Date and Time Manipulation
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Date and time manipulation can be quite challenging . What s the correct way to express date and time literals How do you identify the weekday of a date in a language-neutral manner How do you separate date and time prior to SQL Server 2008 The following sections provide some answers to these questions .
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Date and Time Functions
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The list of date and time functions supported by SQL Server is short, but the functions are handy . These functions perform correct date and time calculations and take into account leap years (to some extent) and other calendar details . Therefore, it s advisable to use them whenever possible and avoid using your own manipulations . SQL Server 2008 introduces several new functions related to date and time data, and it provides enhancements to the existing date and time functions for the new types and the increased precision they provide . I ll describe the list of functions briefly in the next section, and make use of them in subsequent sections .
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Functions Supported Prior to SQL Server 2008
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The following date- and time-related functions were supported prior to SQL Server 2008: DATEADD, DATEDIFF, DATEPART, DAY, MONTH, YEAR, DATENAME, GETDATE, CURRENT_ TIMESTAMP, GETUTCDATE, and ISDATE . All are still supported in SQL Server 2008, with enhancements for the new data types . DATEADD allows you to add a specified number of some date and time unit to a given date and time value . For example, the expression DATEADD(month, 1, 20090725 ) adds one month to July 25, 2009 . Subtraction is achieved by adding a negative number of units . Note The DATETIME and SMALLDATETIME data types support using the plus (+) and minus ( )
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operators with an integer to add or subtract a number of days as an alternative to using the DATEADD function . For example, DATEADD(day, 1, dt) is equivalent to dt + 1 . It is probably a bad practice to rely on this alternative because it makes the code less clear . Also, none of the new data types introduced in SQL Server 2008 supports this option .
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DATEDIFF calculates the difference in a specified date part between two date and time values . For example, the expression DATEDIFF(month, 20090725 , 20090825 ) calculates the difference in months between July 25, 2009 and August 25, 2009 . Caution The DATEDIFF function doesn t take into consideration higher levels of granularity
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than the specified date part; rather, it takes into consideration only lower ones . For example, when you calculate the following difference in years between two very close values, you get 1: DATEDIFF(year, 20091231 , 20100101 ) . DATEDIFF ignores those part of the values that have a higher level of granularity than year . (That is, it ignores the month, day, hour, and so on .)
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10 Working with Date and Time
Using DATEPART, you can extract a specified date and time part from a date and time value, and it gives an integer result . For example, the expression DATEPART(hour, 20090118 14:39:05.370 ) extracts the hour portion of the input DATETIME value . The YEAR, MONTH, and DAY functions are abbreviations of the DATEPART function that return the year, month, and day of the month, respectively . DATENAME is similar to DATEPART, but it returns the name of the date part (or the numeral if there is no name) as a character string . For example, the expression DATENAME(weekday, 20090118 14:39:05.370 ) returns the weekday name of the input DATETIME value . Note that some of the results that you get from expressions involving DATETIME functions are language-dependent . For example, the expression DATENAME(weekday, 20090118 14:39:05.370 ) will return Sunday if the session s language is set to us_english, and domenica if it is set to Italian . GETDATE gives you the server s local date and time value, and GETUTCDATE gives you the current Coordinated Universal Time (UTC), which is calculated from the server s local time and time zone settings . The CURRENT_TIMESTAMP function is the ANSI form of GETDATE . The last three functions accept no arguments . Finally, the ISDATE function accepts a character string as input, and returns 1 if the value can be converted to DATETIME or SMALLDATETIME and 0 if it cannot . For example, the expression ISDATE( 20090229 ) returns 0, whereas the expression ISDATE( 20120229 ) returns 1 . Note that in SQL Server 2008 this function was not enhanced to recognize values that can be converted to one of the new date and time types, but not to one of the older ones for example, the expression ISDATE( 20100212 10:00:00.1234567 ) returns 0 even though the value can be converted to DATETIME2 .
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