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

1 vote296 views1 answer
What is int in mysql
SQL
12 votes282 views2 answers
Delete all data in neo4j
SQL
0 vote298 views1 answer
Could not assemble any primary key columns for mapped table sqlalchemy
SQL
17 votes293 views6 answers
Get last record in sql
SQL
1 vote317 views1 answer
Sql server today minus n
SQL
22 votes327 views3 answers
How to join three tables in sql using joins
SQL
0 vote286 views1 answer
Mariadb used space
SQL
0 vote274 views1 answer
Automate mysql cli query
SQL
0 vote307 views1 answer
Alter table add column in SQL Server- NAYCode.com
SQL
16 votes304 views4 answers
Ascending order mysql
SQL