Find duplicate values in database table

Description:

Detect fields that have duplicate values in a database table.

Solution:

For finding duplicate values, the COUNT condition can be used, specifying the column name that we require.

Example:

SELECT customer_id
FROM customers_table
GROUP BY customer_id
HAVING count( * ) > 1;

Also we can define the count ot be greater than 1, depending on the needs.

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