Question

Hey guys I just noticed that my join statement here

        SELECT *
        FROM reports rpt
        JOIN (
            (SELECT report_key, shipper, po, commodity, label
            FROM berries)
            UNION 
            (SELECT report_key, shipper, po, commodity, label
            FROM melons)
            UNION 
            (SELECT report_key, shipper, po, commodity, label
            FROM citrus)
            UNION 
            (SELECT report_key, shipper, po, commodity, label
            FROM table_grapes)
            UNION 
            (SELECT report_key, shipper, po, commodity, label
            FROM tree_fruit)
            UNION 
            (SELECT report_key, shipper, po, commodity, label
            FROM lot)
        ) fruits ON rpt.inspection_number = fruits.report_key
        WHERE rpt.status < '2' 
        ORDER BY rpt.inspection_number DESC

is returning each row where the query meets the condition, what I was after was trying to
get it to return ONE row, what did I do wrong?

Answer 1

You can add a limit n clause to the end to get it to only return one row:

    SELECT *
    FROM reports rpt
    JOIN (
        (SELECT report_key, shipper, po, commodity, label
        FROM berries)
        UNION 
        (SELECT report_key, shipper, po, commodity, label
        FROM melons)
        UNION 
        (SELECT report_key, shipper, po, commodity, label
        FROM citrus)
        UNION 
        (SELECT report_key, shipper, po, commodity, label
        FROM table_grapes)
        UNION 
        (SELECT report_key, shipper, po, commodity, label
        FROM tree_fruit)
        UNION 
        (SELECT report_key, shipper, po, commodity, label
        FROM lot)
    ) fruits ON rpt.inspection_number = fruits.report_key
    WHERE rpt.status < '2' 
    ORDER BY rpt.inspection_number DESC
    LIMIT 1                                               -- limit !!

This will return the first row.