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  • New Date Datatypes in SQL Server 2008 | TechRepublic

    http://www.techrepublic.com/blog/datacenter/new-date-datatypes-in-sql-server-2008/443[08/29/2012 3:44:51 PM]

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    By Tim ChapmanSeptember 8, 2008, 10:59 AM PDT

    Takeaway: SQL Server 2008 provides new data-types for storing wider ranges of dates withmore precision. Heres can you can use these new data types to your advantage in SQL Server2008.

    As a database architect, one of the features I am most excited about in SQL Server 2008 is thenew date related data types. These data types allow for the storage of time-only data, date-onlydata, a larger range of date values, more time precision, and the ability to store time-zone specificdates. Today Ill take a look at these great new data types and how they can be used to expandyour date storage possibilities.

    DATEThe new DATE data-type defines a date field without any associated time. In previous versions ofSQL Server, storing time-only data was accomplished in one of two ways. First, you could defineeither a DATETIME or SMALLDATETIME data type and assign the value as a VARCHAR value.Then you would need to handle the time related data in your queries. The other way is to store thedate value in a VARCHAR field in the database. Either way, handling date-only data was at bestcumbersome. With the new DATE data-type, it intrinsically stores only date values. In the followingexample I define a DATE data-type and a DATETIME data type and assign todays date to thevariables. As you can see from SELECTing the values from the variables, the DATE variable holdsonly the date portion whereas the DATETIME field also stores the associated time from theGETDATE() function.

    DECLARE @TodaysDate DATE = GETDATE()

    DECLARE @TodaysDateTime DATETIME = GETDATE()

    SELECT @TodaysDate, @TodaysDateTime

    Storing DATE specific data will also make queries easier to write. Instead of using one of thefollowing statements to pull data for a DATETIME column;

    SELECT * FROM SalesHistory

    WHERE SaleDate >= 4/11/2008' AND SaleDate < 4/12/2008'

    you can use an equality operator (=) to search only for the specific date, assuming theSaleDateOnly field is defined as a DATE data-type.

    SELECT * FROM SalesHistory

    WHERE SaleDateOnly = 4/11/2008'

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  • New Date Datatypes in SQL Server 2008 | TechRepublic

    http://www.techrepublic.com/blog/datacenter/new-date-datatypes-in-sql-server-2008/443[08/29/2012 3:44:51 PM]

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    DATETIME2This data type is very simiilar to the datetime data type present in previous versions of SQLServer. The difference is the time precision and the range of dates that DATETIME2 can store.The new DATETIME2 data type can hold a range of dates from 0001-01-01 through 9999-12-31while DATETIME holds the date range from 1753-01-01 to 9999-12-31. Another benefit of thisdata type is the precision in which it records time. DATETIME2 is accurate to within 100nanoseconds whereas DATETIME is accurate to within 3/1000 of a second. The following scriptcompares the values that the DATETIME and the DATETIME2 data-types can hold.

    DECLARE @DateTime2 DATETIME2 = GETDATE()

    DECLARE @DateTime DATETIME = GETDATE()

    SELECT @DateTime, @DateTime2

    Notice the additional precision stored in the DATETIME2 variable. This additional data can be ofmajor significance for those applications where time related information is mission-critical.

    TIMEThe TIME data-type stores only the time portion of a date. This is significant in that the time datacan be stored seperately and not associated with a specific date. The TIME data-type, like theDATETIME2 data-type is accurate up to 100 nanoseconds. The following script compares the timespecific information returned by the TIME data type and that which is returned from a DATETIMEdata type.

    DECLARE @Time TIME = GETDATE()

    DECLARE @DateTime DATETIME = GETDATE()

    SELECT @Time, @DateTime

    DATETIMEOFFSETThe new DATETIMEOFFSET data type combines the range and precision of the DATETIME2data-type along with time-zone awareness based on a 24 hour clock. The time-zone awareness isaccomplished by adding or subtracting an hours + minutes value to the date data. In the followingexample, I define a temporary table that holds two fields. The first field holds the date that is localto my area. The second field, BeijingTime, is an offset date that will hold the time in Beijing, China;which happens to be 12 hours ahead of the time in Louisville, KY.

    CREATE TABLE #OffSets

    (

    LouisvilleTime DATETIME2 DEFAULT(GETDATE()),

    BeijingTime AS CONVERT(VARCHAR(50), LouisvilleTime, 121) + '+12:00'

    )

    INSERT INTO #OffSets(LouisvilleTime)

    SELECT GETDATE()

    SELECT * FROM #OffSets

    As you can see from the results from the table, the BeijingTime field holds the date from theLouisvilleTime field along with a 12 hour offset to indicate Beijing time. This data-type greatlyenhances the ability to create time-zone aware applications.

    TIME to try the new data-typesThe new date related data-types included in SQL Server 2008 greatly expand the databasedevelopers ability to not only store a wider range of dates and precision for those dates, but alsothe ability to zone time-zone specific data which can lead to more robust and accurate reporting oftime-related data around the world.

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  • New Date Datatypes in SQL Server 2008 | TechRepublic

    http://www.techrepublic.com/blog/datacenter/new-date-datatypes-in-sql-server-2008/443[08/29/2012 3:44:51 PM]

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    "Odd that it can go so far forward but not back far enough for some historical,geological, or anthropoligical data" Actually, I was kind of wondering about the abilityto go past 1753 with any... Read Whole Comment +

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    Calendar issuesrwilson@... 24th Feb 2009

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    Exampleschapman.tim@... 10th Sep 2008

    Sure, here are some examples:

    DATE:2007-05-08

    TIME:12:35:29. 1234567

    DATETIME2:2007-05-08 12:35:29. 1234567

    DATETIMEOFFSET:2007-05-08 12:35:29.1234567 +12:15

    0Votes

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  • New Date Datatypes in SQL Server 2008 | TechRepublic

    http://www.techrepublic.com/blog/datacenter/new-date-datatypes-in-sql-server-2008/443[08/29/2012 3:44:51 PM]

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    Its about time we get a DATE type! I always tested date ranges like this: SELECT *FROM SalesHistory WHERE SaleDate Between @SaleDate AND @SaleDate + '11:59 pm' Of course @SaleDate was formatted... Read Whole Comment +

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    RE: New Date Datatypes in SQL Server 2008dwarsham@... 10th Sep 2008

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