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"IF ... ELSE IF ..." Statement Structures in SQL Server
How To Use "IF ... ELSE IF ..." Statement Structures in SQL Server Transact-SQL?
✍: FYIcenter.com
"IF ... ELSE IF ..." statement structure is used to select one of the specified statements to be executed based on specified Boolean conditions. Here is the syntax of "IF ... ELSE IF ..." statement structure:
IF condition_1 statement_1; ELSE IF condition_2 statement_2; ... ELSE IF condition_n statement_n; ELSE statement_o; IF condition_1 -- statement_block_1; BEGIN ... statements ... END ELSE IF condition_2 -- statement_block_2; BEGIN ... statements ... END ... ELSE IF condition_n -- statement_block_n; BEGIN ... statements ... END ELSE -- statement_block_o; BEGIN ... statements ... END
When a IF...ELSE IF ... statement is executed, the system will:
The tutorial exercise below shows you how to use an IF ... ELSE IF ... statement structure to selectively execute one of the CREATE TABLE statements:
DECLARE @site_name VARCHAR(40); SET @site_name = 'SQA'; IF @site_name = 'DBA' CREATE TABLE dba_links (url VARCHAR(256)); ELSE IF @site_name = 'SQA' CREATE TABLE sqa_links (url VARCHAR(256)); ELSE PRINT 'Unknown site name: '+@site_name; GO Command(s) completed successfully. SELECT name FROM sys.tables WHERE name LIKE '%links'; GO sqa_links
Here is another example of IF ... ELSE IF ... statement using statement blocks:
DECLARE @site_name VARCHAR(40); SET @site_name = 'SQA'; IF @site_name = 'DBA' BEGIN PRINT 'Dropping table: dba_links'; DROP TABLE dba_links; END ELSE IF @site_name = 'SQA' BEGIN PRINT 'Dropping table: sqa_links'; DROP TABLE sqa_links; END ELSE PRINT 'Unknown site name: '+@site_name; GO Dropping table: sqa_links
⇒Conditional Statements and Loops in SQL Server in SQL Server Transact-SQL
2017-01-11, 1554👍, 0💬
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