GROUP BY 和 HAVING 子句。，，``sql，SELECT column_name, COUNT(*)，FROM table_name，GROUP BY column_name，HAVING COUNT(*) > 1;，`，，这条查询语句会返回 table_name 中 column_name` 列的所有重复值及其出现的次数。Powered By Z-BlogPHP 1.7.3
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