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聽聽 聽鏌ヨ濮撳悕鐩稿悓鐨勭敤鎴風(fēng)殑鏁伴噺鍜屽鍚嶏細(xì)
聽聽聽 Select count(*) ,username from userinfo
聽聽聽 Group By聽username
聽聽聽 Having count(*) >1聽聽聽
聽聽聽 鏌ヨ緇撴灉濡備笅錛?br />
聽聽聽 COUNT(*)聽USERNAME
聽聽聽 4聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽璁告槑
聽聽聽 2聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 鍒樿搗榫?br />聽聽聽 17聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 鐜嬫搗娑?br />
鍒犻櫎鐩稿悓鏁版嵁
聽聽聽 Delete from userinfo Group By聽username Having count(*) > 1