Transact-SQL reference for the CASE expression. CASE evaluates a list of conditions to return specific results.
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Applies to: Azure SQL Database and SQL Server starting SQL Server 2017 (14.x) CASE expressions are supported in natively compiled T-SQL module
傳回第一個評估為 TRUE 之input_expression=when_expression的result_expression。 如果沒有任何input_expression=when_expression評估為 TRUE,若指定了 ELSE 子句,SQL Server 資料庫引擎就會傳回else_result_expression,若未指定 ELSE 子句,則會傳回 NULL 值。
–简单Case函数 CASE sex WHEN ‘1’ THEN ‘男’ WHEN ‘2’ THEN ‘女’ ELSE ‘其他’ END ...
case when in sql server's stored procedure Evaluates a list of conditions and returns one of multiple possible result expressions. The CASE expression hastwo formats: The simple CASE expression compares an expression to a set of simple expressions to determine the result....
Boolean_expression 计算结果为标量值的 MDX 表达式。 备注 如果没有 ELSE 子句,而且所有 WHEN 子句的计算结果都为 False,则结果是空单元。 简单Case 表达式 MDX 通过将input_expression解析为标量值来计算简单的 case 表达式。 然后将此标量值与when_expression的标量值进行比较。 如果两个标量值匹配,则 CASE 语句...
在SQL查询中,你可以使用CASE表达式为特定条件赋值。CASE 表达式允许你根据某个条件的结果,选择不同的值进行赋值。 CASE 表达式的种类: 有简单 CASE 表达式 (simple case expression) 搜索CASE 表达式(searched case expression) 简单CASE表达式: 搜索CASE表达式: ...
The SQL CASE Expression TheCASEexpression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in theELSE...
In the order specified, evaluates input_expression = when_expression for each WHEN clause. Returns theresult_expressionof the firstinput_expression=when_expressionthat evaluates to TRUE. If noinput_expression=when_expressionevaluates to TRUE, the SQL Server Database Engine returns theelse_result_expres...
case when in sql server's stored procedure https://docs.microsoft.com/en-us/sql/t-sql/language-elements/case-transact-sql Evaluates a list of conditions and returns one of multiple possible result expressions. The CASE expression hastwo formats:...