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📜  在 mysql 代码示例中查找重复键

📅  最后修改于: 2022-03-11 15:05:21.581000             🧑  作者: Mango

代码示例3
SELECT 
    col1, COUNT(col1),
    col2, COUNT(col2)
FROM
    table_name
GROUP BY 
    col1, 
    col2
HAVING 
       (COUNT(col1) > 1) AND 
       (COUNT(col2) > 1);