/////////////////////目地：ZDJZ_DIS中 name字段有重复的值，删除重复的值 DELETE * FROM ZDJZ_DIS WHERE NAME IN (select NAME from ZDJZ_DIS group by NAME having count(NAME) >1); 上面的做法会删除掉所有的相同的值，包括你想要的，只要重复就删除 DELETE * FROM ZDJZ_DIS WHERE ID in (select min(ID) from ZDJZ_DIS group by NAME having count(NAME)>1); 1有没有重复的某项值 2如果有的话，选择ID最小的那个 结合起来 DELETE * FROM ZDJZ_DIS WHERE NAME IN (select NAME from ZDJZ_DIS group by NAME having count(NAME) >1) and ID not in (select min(ID) from ZDJZ_DIS group by NAME having count(NAME)>1);
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