mysql 進行過濾查詢

1.查找重複字段p_name的重複條數

Select p_name,count(*) as count from zyx_member group by p_name having count>1;

2.查詢new 表中去除title字段的重複數據，顯示id最大的那條數據

Select * From new Where id In (Select Max(id) From new Group By title) ；

3.查詢表中重複數據

Select * From 表 Where 重複字段 In (Select 重複字段 From 表 Group By 重複字段 Having Count(*)>1)