SQL語句查詢數據庫中重復記錄的個數

代碼如下：

select a,b,c,count(*) from (select c.a,c.b,c.c from test c) having count(*) >= 2 group by a,b,c

或者
代碼如下：

select zdbh,tdzl,zdmj,count(*) from ecaadmin.zdsx group by zdbh,tdzl,zdmj having count(*) >= 2