For instance, the date 20150709 will at all times interpreted as ninth July 2015 by SQL Server, no matter language setting. Because of this it is thought-about greatest observe to enter date as YYYYMMDD String in Microsoft SQL Server.
Necessary factors
1) When a language setting is utilized in Microsoft SQL Server, it units many variable respective to that language and certainly one of them is DATEFORMAT. That is why a String not entered in language impartial approach will likely be interpreted in a different way by completely different SQL Server cases with completely different language settings.
2) Similar date 07-12-15 could be interpreted as seventh December 2015 if language is ready to en-UK, twelfth July if language is American English.
3) If you don’t need that SQL Server implicitly convert VARCHAR to DATETIME sort, you should utilize PARSE() or CONVERT() perform to offer a formatting model. This can be certain that SQL SERVER interpret the String in the identical date format no matter language setting e.g.
SELECT CONVERT(DATETIME, '09-10-2015', 104);
will be certain that given date is at all times on DD-MM-YYYY format, also referred to as British Date format.
5) In SQL Server 2008, separate DATE and TIME knowledge sorts have been launched, additionally they have couple of different DATEFORMAT which is language impartial, e.g. YYYY-MM-DD (2015-07-31) can be language impartial for DATE sort however on account of legacy causes it isn’t language impartial for DATETIME and SMALLDATETIME sorts. Alternatively, YYYYMMDD is language impartial for all of date and time knowledge sorts in SQL SERVER.
6) When Microsoft SQL Server converts a String to DATETIME which solely accommodates date half, it thought-about time advert midnight and enter ’00:00:00.000′ for time half. This is essential element to know in case your DATETIME column accommodates each date and time half. Why? as a result of it could create delicate bugs whereas evaluating Date in Java as proven right here.
That is all about Why must you at all times enter date as “YYYYMMDD” in SQL SERVER. This can keep away from the bug created by completely different language setting at completely different SQL SERVER cases. It is the language impartial format for all SQL SERVER DATE and TIME knowledge sorts together with DATETIME, DATE, TIME, DATETIME2 and SMALLDATETIME.
You can even additional learn Microsoft SQL SERVER 2012 T-SQL Fundamentals and Querying Microsoft SQL SERVER 2012, the 70-461 Examination Information to be taught extra about SQL Server particulars like this.
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