摘要：
先查询某字段重复的全部数据 select count(param) as count from table group by param having count > 1 (多个字段判断重复数据) select count(param) as count1, count(param2) count2 阅读全文
摘要：
https://www.cnblogs.com/fashflying/p/6908028.html https://blog.csdn.net/u010588262/article/details/81003493 阅读全文