sql，SELECT column_name, COUNT(*)，FROM table_name，GROUP BY column_name，HAVING COUNT(*) > 1;，``，，这段代码会返回在指定列中出现次数超过一次的所有数据。sql，SELECT column_name, COUNT(*)，FROM table_name，GROUP BY column_name，HAVING COUNT(*) > 1;，``，，这段代码会返回在指定列中出现次数超过一次的所有数据。Powered By Z-BlogPHP 1.7.3
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