weixin_46196127的博客上面的 SQL语句怎么更换成下面这种的?(用union alll) select … ,“29岁以下” as category, 29岁以下 as value from XXX union all select … ,“30-39岁” as category, 30-39岁 as value from XXX
康三说的博客Mysql优化 sql语句优化 这是我遇到的一句sql语句 执行时间为2s多 select t . USER_ID AS USER_ID , (select u . USER_NAME from auth_user u where ( u . ID = t . USER_ID )) AS USER_NAME , r . ID AS ID , r . ...
weixin_46196127的博客上面的 SQL语句怎么更换成下面这种的?(用union alll) select … ,“29岁以下” as category, 29岁以下 as value from XXX union all select … ,“30-39岁” as category, 30-39岁 as value from XXX ————...