错误代码: DELETE FROMpayment WHEREserial IN ( SELECT serial FROM payment GROUP BY serial HAVING count(*) > 1 ) AND id NOT IN ( SELECT min( id ) AS id FROM payment GROUP BY serial HAVING count( serial )
1.现象mysql升序排序的null结果排最前面 select * FROM payment ORDER BY serial ASC; -- null值最前面 结果: 2.现象mysql降序序排序的null结果排最后面 select * FROM payment ORDER BY serial DESC; -- NULL 值最后 结果: 3.使mysql升序排序的n
从MySQL官网下载Mysql,在本地安装好之后,用数据库连接工具Sequl Pro去连接数据库,发现报错了,报错信息有两种: Error1:Unable to connect to host 127.0.0.1 because access was denied.Double-check your username and password and ensure that access fro
Java连mysql提示Access denied for user ‘root’@‘localhost’ (using password: YES),但用CMD和Navicat可以访问mysql成功 今天遇到个问题,一个Java项目,运行起来,登录报错Access denied for user ‘root’@‘localhost’ (using password: YES) 但是我的MySQ