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    CASE Statement in SQL Examples

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    Problem

    In the T-SQL scripting language, you can use the SQL CASE statement to evaluate a condition and return one or more result expressions.

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    • This SQL Tutorial will teach you when and how you can use CASE in T-SQL statements.

    Solution

    The CASE expression is used to build IF … THEN … ELSE statements into your Microsoft SQL Server T-SQL code. CASE is used within a SQL statement, such as SELECT or UPDATE.

    Don’t mistake CASE for the IF ELSE control of flow construct, which is used to evaluate the conditional execution of SQL statements.

    Let’s illustrate with an example. The following SQL statement will return “Monday” if today is a Monday, otherwise it returns “Not a Monday”.

    SETDATEFIRST 1 -- first day of the week is a Monday SELECTCASEWHENDATEPART(WEEKDAY,GETDATE())= 1 THEN'Monday'ELSE'Not a Monday'END

    The following SQL script does the same, but rather uses the IF … ELSE construct to switch between two different statements, instead of calculating the result in one

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