MySQL 让主键id 从1开始自增
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sql 查出一张表中重复的所有记录数据select count(fieldname) as '重复次数',fieldname from table_name group by fieldname having count(*)>1 order by fieldname de...
遇到的问题安装了mysql5.7,用group by 查询时抛出如下异常: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'userinfo. 原因:MyS...
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver spring.datasource.url=jdbc:mysql://47.100.120.27:3306/news spring.datasource.username=n...
转载来源: https://blog.csdn.net/qq_37918817/article/details/111032247 一、一个procedure实例实现循环更新一张表的排序号功能,有多少条数据,就从1排到几。 DROP PROCEDURE IF EXISTS `update_old...