严格来讲不应该叫“mysql条件判断语句case when”他的专业术语应该叫“mysql 流程控制语句case语法” 用法1: case变量 CASE case_value WHEN when_value THEN statement_list WHEN when_value2 THEN statement_list2 … ELSE statement 1. 2. 3. 4. 5. END 用法2: case表达式 CASE WHEN search_condition THEN...
原因:CASE WHEN 中的条件逻辑错误,导致返回的结果不符合预期。 解决方法:仔细检查 CASE WHEN 中的条件逻辑,确保每个条件都能正确判断并返回预期的结果。 示例代码 代码语言:txt 复制 -- 数据转换示例 SELECT id, CASE status WHEN 'active' THEN '启用' WHEN 'inactive' THEN '禁用' ELSE '未知' END AS sta...
case when when when作为计算列 linux case when js case when case-when update case when case_when case when then where Postgres - Case - When Doctrine - CASE WHEN CASE WHEN from嵌套CASE WHEN无子查询? Case when with else for每个'When‘条件 Mysql SELECT CASE WHEN然后返回字段 页面内容是否对你...
当然，这还没有经过测试--假设我正在尝试它，但您必须让我知道它是如何工作的。
USEAdventureWorks2022; GOSELECTProductNumber,Category=CASEProductLineWHEN'R'THEN'Road'WHEN'M'THEN'Mountain'WHEN'T'THEN'Touring'WHEN'S'THEN'Other sale items'ELSE'Not for sale'END,NameFROMProduction.ProductORDERBYProductNumber; GO B. Use a SELECT statement with a searched CASE expression ...
Mysql SUM() 配合case when 做库存统计 需求是统计不同物料名称,不同颜色分类的库存数量,有一个标记出库、入库的字段State(0-入库 1-出库) 这里需要用到sum函数,使用Case when 能根据出库、入库来确定数量的增加或者减少,最后使用 group by 进行分组。 select Name as ‘物料名称’ , Color as ‘颜色’, ...
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USEAdventureWorks2022; GOSELECTProductNumber,Category=CASEProductLineWHEN'R'THEN'Road'WHEN'M'THEN'Mountain'WHEN'T'THEN'Touring'WHEN'S'THEN'Other sale items'ELSE'Not for sale'END,NameFROMProduction.ProductORDERBYProductNumber; GO B. Use a SELECT statement with a searched CASE expression ...
SQL中的 CASE 类似编程语言里的 if-then-else 语句,用做逻辑判断。可以用于SELECT语句中,也可以用在WHERE,GROUP BY 和 ORDER BY 子句;可以单独使用,也可以和聚合函数结合使用。 语法如下: CASEWHENcondition1THENresult1[WHENcondition2THENresult2][...][ELSEresult]END[ASalias_name]注:[]中的内容可省略 ...
It is not clear to me if the same feature is provided with MySQL's 'case' statement. CASE N WHEN 1 THEN SELECT "One" WHEN 2 WHEN 3 THEN SELECT "Two or Three" ELSE SELECT "The number is outside range" CASE END; This gives a SQL syntax error. ...