Question

SELECT COUNT(organization.ID)
FROM organization
WHERE organization.NAME IN (
    SELECT organization.NAME
    FROM organization
    WHERE organization.NAME <> ''
        AND organization.APPROVED = 0 
        AND organization.CREATED_AT > '2012-07-31 04:31:08'
    GROUP BY organization.NAME
    HAVING COUNT(organization.ID) > 1
)

This query finds duplicates, the problem is that it takes 6 seconds for the page to load because of the inner statement. Is there a way to make it run faster? MySQL database version 5.1.

Answer 1

Try to avoid IN.

SELECT COUNT(organization.ID)
FROM 
    organization
    INNER JOIN 
    (
        SELECT organization.NAME
        FROM organization
        WHERE organization.NAME <> ''
            AND organization.APPROVED = 0 
            AND organization.CREATED_AT > '2012-07-31 04:31:08'
        GROUP BY organization.NAME
        HAVING COUNT(organization.ID) > 1
    ) AS t ON organization.NAME = t.Name