Sql check double value

Sql query to find duplicates in column

SELECT name, COUNT(email) 
FROM users
GROUP BY email
HAVING COUNT(email) > 1

Source: stackoverflow.com

Sql check double value

SELECT
    name, email, COUNT(*)
FROM
    users
GROUP BY
    name, email
HAVING 
    COUNT(*) > 1

Source: stackoverflow.com

FIND DUPLICATES IN COLUMN SQL

declare @YourTable table (id int, name varchar(10), email varchar(50))

INSERT @YourTable VALUES (1,'John','John-email')
INSERT @YourTable VALUES (2,'John','John-email')
INSERT @YourTable VALUES (3,'fred','John-email')
INSERT @YourTable VALUES (4,'fred','fred-email')
INSERT @YourTable VALUES (5,'sam','sam-email')
INSERT @YourTable VALUES (6,'sam','sam-email')

SELECT
    name,email, COUNT(*) AS CountOf
    FROM @YourTable
    GROUP BY name,email
    HAVING COUNT(*)>1

-1

Source: stackoverflow.com

Similar codes

0 vote190 views1 answer
How to drop columns with constraint from a table in sql script
SQL
3 votes193 views1 answer
Mssql remove column
SQL
0 vote201 views1 answer
Flask sqlalchemy session delete
SQL
2 votes179 views1 answer
Mysql list users on ubuntu
SQL
0 vote153 views1 answer
Now() -1 mysql
SQL
1 vote181 views1 answer
Substr sql last character
SQL
1 vote197 views1 answer
Oracle sql listagg
SQL
0 vote209 views1 answer
Oracle 11g forget password
SQL
-1 vote181 views1 answer
An error occurred while installing mysql (2.9.1), and Bundler cannot continue
SQL
0 vote194 views1 answer
Sql column as header
SQL