www.3112.net > mysql的中ConCAt问题

mysql的中ConCAt问题

MySQL的concat函数可以连接一个或者多个字符串,如 mysql> select concat('10');+--------------+| concat('10') |+--------------+| 10 |+--------------+1 row in set (0.00 sec) mysql> select concat('11','22','33');+---------------------...

你这要查的表都没有.

group_concat(SKT7.SKF76,skt7.SKF77) 部分改成 group_concat(case when SKT7.SKF76=skt7.SKF77 then SKT7.SKF76 else CONCAT(SKT7.SKF76,skt7.SKF77) end)

SELECT a.*,group_concat(b.picture_path) FROM ep_pollution_comments a LEFT JOIN ep_pollution_comments_picture b ON a.comments_id = b.comments_id group by a.comments_id,a.pollution_id,a.comments_chile,a.comments_info, a.create_ti...

SELECT a.*,group_concat(b.picture_path) FROM ep_pollution_comments a LEFT JOIN ep_pollution_comments_picture b ON a.comments_id = b.comments_id group by a.comments_id,a.pollution_id,a.comments_chile,a.comments_info, a.create_ti...

用法:字符串拼接: m.table_Name like concat(concat('%',#{tableName}),'%')----------------------就是拼接成% 变量值% select * from m where m.name like concat(concat('%','#tableName'),'%');

concat_ws()函数, 表示concat with separator,即有分隔符的字符串连接 如连接后以逗号分隔 mysql> select concat_ws(',','11','22','33'); +-------------------------------+ | concat_ws(',','11','22','33') | +----------------------------...

本来程序数据库用的是mysql,后来转为sql server2005, 其中一个sql为: select * from dbo.sys_person_info t where t.VALID_FLAG>0 and t.dept_id in(select a.dept_code from sys_dept a,sys_dept b where a.sort_no like concat(b.sort_no,'%'...

字符串连接起来 SQL 语句是没有问题的。看具体什么错误了。

mysql中CONCAT的用法如下: 1.>CONCAT拼接字符串 SELECT CONCAT('HELLO', ' WORLD') AS expr >GROUP_CONCAT可以和GROUP BY语句一起用 SELECT GROUP_CONCAT(name) AS names FROM xxx 2.SELECT GROUP_CONCAT(name) AS names FROM xxx GROUP BY yy ...

网站地图

All rights reserved Powered by www.3112.net

copyright ©right 2010-2021。
www.3112.net内容来自网络,如有侵犯请联系客服。zhit325@qq.com