Transact-SQL provides control-of-flow language that you can use as part of any SQL statement or batch. These constructs are available: begin...end, break, continue, declare, goto label, if...else, print, raiserror, return, waitfor, and while. You can define local variables with declare and assigned values. A number of predefined global variables are supplied by the system.
Transact-SQL also supports case expressions, which include the keywords case, when, then, coalesce, and nullif. case expressions replace the if statements of standard SQL. case expressions are allowed anywhere a value expression is used.
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