摘要:
查重: select no from table_name group by no having count(no)>1; 删除重复数据中id较大的数据: delete from table_name where no in (select no from table_name group by n 阅读全文
posted @ 2020-11-11 14:51
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摘要:
select @rownum:=@rownum+1 rownum, sys_organ.* from (select @rownum:=0) r, sys_organ order by sys_id desc; 更新某一字段等于所在行号: set @num = 0; update sys_organ 阅读全文
posted @ 2020-11-11 14:44
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