find duplicate keys in mysql

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1SELECT name, COUNT(*) c FROM table GROUP BY name HAVING c > 1;

1SELECT col, COUNT(col) FROM table_name GROUP BY col HAVING COUNT(col) > 1;

1SELECT 
2    col1, COUNT(col1),
3    col2, COUNT(col2)
4FROM
5    table_name
6GROUP BY 
7    col1, 
8    col2
9HAVING 
10       (COUNT(col1) > 1) AND 
11       (COUNT(col2) > 1);
12

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