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...
CASE用法CASEWHEN condition1 THEN returnvalue1 WHEN condition 2 THEN returnvalue2 &nbs case when 原创 codejson 2016-11-13 01:25:31 2217阅读 SQLServer中Casewhen的一个意外问题 在论坛回答问题时,发现测试脚本会出现如下问题,百思不得其解。 set nocount oncreate table test(a varchar(10))insert into...
TheCASEexpression evaluates its conditions sequentially and stops with the first condition whose condition is satisfied. In some situations, an expression is evaluated before aCASEexpression receives the results of the expression as its input. Errors in evaluating these expressions are possible. Aggregate...
2) Case:a) If the value of the <search condition> of some <searched when clause> in a <...
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 * INTO newtable [IN externaldb] FROM oldtable WHERE condition; 只复制
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; ...
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 ...
Access Code - DELETE Statement with DISTINCTROW and T-SQL Access Now() vs. T-SQL GETDATE() ? ADD and SUBTRACT depending on the condition is CASE STATEMENT ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a lar...
There may be situations where different WHEN expressions evaluate to TRUE in a single CASE expression. When this happens SQL Server will return the result expression associated with the first WHEN expression that evaluates to true. Therefore the order of your WHEN clauses will control what result ...