Control-of-flow keywords
Control-of-flow keywords help SQL Server determine when and how Transact-SQL statements should execute. With these keywords, you can add logic around and within Transact-SQL statements to control program execution. Control-of-flow keywords add greater flexibility in OLTP application design and help you write clever code. Control-of-flow keywords include BEGIN…END, IF…ELSE, CASE, WHILE, BREAK, CONTINUE, RETURN, GOTO, and WAITFOR.
BEGIN…END keywords
The BEGIN…END keywords identify a code block. We typically use them to group Transact-SQL statements. The BEGIN…END blocks can be nested. We also use BEGIN…END statements to identify a code block in an IF…ELSE clause, WHILE loop, and CASE element. The following is the basic syntax ...
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