MySQL>SELECT CASE 1 WHEN 1 THEN 'one'->WHEN 2 THEN 'two' ELSE 'more' END;->'one'MySQL>SELECT CASE WHEN 1>0 THEN 'true' ELSE 'false' END;->'true'MySQL>SELECT CASE BINARY 'B'->WHEN 'a' THEN 1 WHEN 'b' THEN 2 END;->NULL 1. 2. 3. 4. 5. 6. 7. 8. 一个CASE表达式...
SELECT CASE WHEN STATUS='1' THEN '状态1' WHEN STATUS='2' THEN '状态2' WHEN STATUS='3' THEN '状态3' WHEN STATUS='0' THEN '状态4' ELSE '状态5' END AS '状态' FROM table; 本文章为转载内容,我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题,欢迎原作者联系我们进行内容更正或删除...
SELECT a.*,DATE_FORMAT(a.createTime,'%Y-%m-%d') createTime, b.pName, case type when 1 then '指挥部会议' when 1 then '指挥部办公室会议' else '指挥部现场协调会' end type FROM meetingInfo a LEFT JOIN projBasic b ON a.pCode = b.pCode WHERE a.id =66 -- 删除 accountInfo 的唯...
case: 类似excel 的lookup函数,专门拿来分组。 用法: case when 分组条件1 then 分组后结果1 when 分组条件2 then 分组后结果2 、、、 when 分组条件N then 分组后结果N end, 1. 2. 3. 4. 5. 6. //分组 SELECT (bottom + top)/2 as avg, case WHEN (bottom + top)/2 <= 10 THEN '0-10'...
SELECT CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ELSE result3 END AS result FROM table;发布于 4 月前 本站已为你智能检索到如下内容,以供参考: 🐻 相关问答 4 个 1、PHP If和Else语句在Wordpress中 2、LIKE语句和PDO / PHP中的特殊字符 3、同样的语句,查询效率相差万倍的SQL...
在日常项目中,mysql的case when then end还是比较有意思的,请看例子: select的使用 数据表结构: 执行语句: SELECT count(*), CASE WHEN role_count between1and100THEN'一般'WHEN role_count between101and1000THEN'不错'WHEN role_count between1001and5000THEN'很棒'WHEN role_count>=5001THEN'非常棒'ELSE'...
mysql case when满足两个条件的判断怎么写 举例说明SELECT CASE a.AFTER_QUALITYWHEN '0' THEN '过免维期'WHEN '1' THEN '未过免维期'ELSE '错误数据'END AS AFTER_QUALITYFROM t_maintain_log a数据库表内容:
可以。例如：user表中有id,name,sex三个字段 select case when (select count(id) from user where sex='男')>10 then '男人有10人以上'else '10人以内' end as count from user;
Bug #110017SELECT returns incorrect value when ORDER BY a CASE WHEN value in left-joined su Submitted:10 Feb 2023 6:27Modified:10 Feb 2023 9:03 Reporter:Taro SuzukiEmail Updates: Status:VerifiedImpact on me: None Category:MySQL Server: OptimizerSeverity:S3 (Non-critical) ...
As soon as MySQL has sent the required number of rows to the client, it aborts the query unless you are using SQL_CALC_FOUND_ROWS. In that case, the number of rows can be retrieved with SELECT FOUND_ROWS(). • LIMIT 0 quickly returns an empty set. This can be useful for checking...