order_id,CASEWHENorder_amount>1000THEN'High'WHENorder_amount>500THEN'Medium'ELSE'Low'ENDASorder_priorityFROMorders; 3. 在 WHERE 子句中使用 CASE 使用SQL CASE 语句根据特定条件过滤数据。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SELECT*FROMcustomersWHERECASEWHENcountry='China'THENsales_region...
SELECT column1, column2 FROM table WHERE CASE WHEN condition1 THEN column1 = value1 WHEN condition2 THEN column2 = value2 ELSE column1 = value3 END 在这个示例中,根据不同的条件,WHERE子句会根据CASE语句的结果选择不同的过滤条件。 腾讯云提供了多个与SQL Server相关的产品和服务,包括云数据库SQL Se...
For a list of control-of-flow methods, see Control-of-Flow Language (Transact-SQL). The CASE expression evaluates its conditions sequentially and stops with the first condition whose condition is satisfied. In some situations, an expression is evaluated before a CASE expression receives the ...
The CASE expression evaluates its conditions sequentially and stops with the first condition whose condition is satisfied. In some situations, an expression is evaluated before a CASE expression receives the results of the expression as its input. Errors in evaluating these expressions are possible. ...
2) Case:a) If the value of the <search condition> of some <searched when clause> in a <...
当然,以下是如何在 SQL Server 中使用 `CASE WHEN` 语句并将其嵌入到条件语句(如 `SELECT`, `UPDATE`, `DELETE`, 和 `WHERE` 子句)中的示例。 ### 基本语法 ```sql CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ... ELSE default_result END ``` ### 在 SELECT 语句中使用 ...
SELECTcolumn1,column2,column3,...INTOnewtable[INexternaldb]FROMoldtableWHEREcondition; 1. 2. 3. 4. 新表将按照在旧表中定义的列名和类型创建。您可以使用AS子句创建新的列名。 SQL SELECT INTO 示例 以下SQL 语句创建Customers的备份副本: SELECT*INTOCustomersBackup2017FROMCustomers; ...
SQL SELECT INTO 语句 SELECT INTO语句将数据从一个表复制到一个新表中。 SELECT INTO 语法 将所有列复制到新表中: SELECT* INTOnewtable [INexternaldb] FROMoldtable WHEREcondition; 只复制一些列到新表中: SELECTcolumn1, column2, column3, ... ...
SQL SELECT INTO 语句 SELECT INTO语句将数据从一个表复制到一个新表中。 SELECT INTO 语法 将所有列复制到新表中: SELECT* INTOnewtable [INexternaldb] FROMoldtable WHEREcondition; 只复制一些列到新表中: SELECTcolumn1, column2, column3, ... ...
SELECTcolumn1, column2, column3, ...INTOnewtable [INexternaldb]FROMoldtableWHEREcondition; 新表将按照在旧表中定义的列名和类型创建。您可以使用AS子句创建新的列名。 SQL SELECT INTO 示例 以下SQL 语句创建Customers的备份副本: SELECT*INTOCustomersBackup2017FROMCustomers; ...