Boolean_expression is any valid Boolean expression. Is the Boolean expression evaluated when using the searched CASE format. The data types of else_result_expression and any result_expression must be the same or must be an implicit conversion. else_result_expression is any valid expression. If this argument is omitted and no comparison operation evaluates to TRUE, CASE returns NULL. Is the expression returned if no comparison operation evaluates to TRUE. result expression is any valid expression. Is the expression returned when input_expression equals when_expression evaluates to TRUE, or Boolean_expression evaluates to TRUE. The data types of input_expression and each when_expression must be the same or must be an implicit conversion. Is a simple expression to which input_expression is compared when the simple CASE format is used. input_expression is any valid expression. Is the expression evaluated when the simple CASE format is used. To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation. WHEN Boolean_expression THEN result_expression WHEN when_expression THEN result_expression Transact-SQL Syntax Conventions Syntax - Syntax for SQL Server, Azure SQL Database and Azure Synapse Analytics For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as select_list, IN, WHERE, ORDER BY, and HAVING. The searched CASE expression evaluates a set of Boolean expressions to determine the result.īoth formats support an optional ELSE argument.ĬASE can be used in any statement or clause that allows a valid expression. The simple CASE expression compares an expression to a set of simple expressions to determine the result. Tips to improve PC performance in Windows 10įix printer problems in Windows 7 and Windows 8.Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW)Įvaluates a list of conditions and returns one of multiple possible result expressions.
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