CODEWITHSUNDEEP
mysqlsql
rrrfusco
rrrfusco

Reputation: 1119

Combine a Join/Subselect Query with a SUM MYSQL Query

First MYSQL query

-- selects the latest records by unique member_id
SELECT * FROM table t
JOIN (SELECT MAX( id ) AS id
FROM table
GROUP BY member_id) t2 ON t2.id = t.id
WHERE `t`.`timestamp` >= DATE_SUB(NOW(), INTERVAL 5 MINUTE)
ORDER BY t.id DESC
LIMIT 10

Second.

-- sums the item_qt column by unique member_id
SELECT SUM(item_qt) AS sum_item_qt FROM table t
WHERE `t`.`timestamp` >= DATE_SUB(NOW(), INTERVAL 5 MINUTE)
GROUP BY member_id
ORDER BY t.id DESC
LIMIT 10

Is there a way to combine these two queries so that sum_item_qt is joined on member_id's?

Upvotes: 1

Views: 1227

Answers (2)

Terje D.
Terje D.

Reputation: 6315

I think this query should give you the answer you are looking for:

SELECT *
FROM table1 t
INNER JOIN
(SELECT MAX(id) AS id, SUM(item_qt) AS sum_item_qt
 FROM table1
 WHERE timestamp >= DATE_SUB(NOW(), INTERVAL 5 MINUTE)
 GROUP BY member_id) AS t2
ON t2.id = t.id
ORDER BY t.id DESC
LIMIT 10

Upvotes: 3

John Woo
John Woo

Reputation: 263803

SELECT  a.*, c.*
FROM    tableName a
        INNER JOIN
        (
            SELECT member_ID, max(ID) maxID
            FROM tableName
            GROUP BY member_ID
        ) b ON  a.member_ID = b.member_ID AND
                a.ID = b.ID
        INNER JOIN
        (
            SELECT  member_ID, SUM(item_qt) sum_item_qt 
            FROM    tableName
            WHERE   timestamp >= DATE_SUB(NOW(), INTERVAL 5 MINUTE)
            GROUP BY member_id
        ) c ON  a.member_ID = c.member_ID
-- WHERE
-- ORDER BY
-- LIMIT

Upvotes: 1

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