Find duplicate keys in mysql

Find duplicates mysql column

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

Source: stackoverflow.com

Select where duplicate mysql

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

Source: mysqltutorial.org

Find duplicate keys in mysql

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

Similar codes

2 votes276 views1 answer
Datefromparts mssql
SQL
11 votes221 views2 answers
Having keyword sql
SQL
0 vote236 views1 answer
Every Derived yable must have its own alias
SQL
8 votes248 views1 answer
Oracle add datafile to tablespace
SQL
0 vote258 views1 answer
T sql dynamic top n query
SQL
2 votes187 views1 answer
Sql float to int
SQL
6 votes254 views2 answers
Psql load dump
SQL
0 vote256 views1 answer
Mysql installer did not find packages in the current bundle suitable for installation
SQL
1 vote241 views2 answers
Oracle list service names
SQL
2 votes257 views2 answers
Postgres change owner of schema
SQL