On the Members table are columns "MemberID" and "PointsEarned".
I want to update the PointsEarned column from the result of this query:
SELECT m.MemberID, m.UserName,
( (SELECT COUNT(*) FROM EventsLog as e WHERE e.MemberID=m.MemberID AND e.EventsTypeID=2)*10 ) +
( (SELECT COUNT(*) FROM EventsLog as e WHERE e.MemberID=m.MemberID AND e.EventsTypeID=3)*3 ) +
( (SELECT COUNT(*) FROM ChatMessages as c WHERE c.MemberID=m.MemberID)*.1 )
as PointsEarned
FROM Members as m
Can anybody tell me how I should do it with a single query?
Thanks!
You may want to try the following:
UPDATE Members m
SET PointsEarned =
( (SELECT COUNT(*) FROM EventsLog as e WHERE e.MemberID=m.MemberID AND e.EventsTypeID=2)*10 ) +
( (SELECT COUNT(*) FROM EventsLog as e WHERE e.MemberID=m.MemberID AND e.EventsTypeID=3)*3 ) +
( (SELECT COUNT(*) FROM ChatMessages as c WHERE c.MemberID=m.MemberID)*.1 );
Test case:
CREATE TABLE Members (MemberId int, PointsEarned int);
CREATE TABLE EventsLog (MemberID int, EventsTypeID int);
CREATE TABLE ChatMessages (MemberID int);
INSERT INTO Members VALUES (1, 0);
INSERT INTO Members VALUES (2, 0);
INSERT INTO Members VALUES (3, 0);
INSERT INTO EventsLog VALUES (1, 2);
INSERT INTO EventsLog VALUES (1, 2);
INSERT INTO EventsLog VALUES (1, 3);
INSERT INTO EventsLog VALUES (2, 2);
INSERT INTO EventsLog VALUES (3, 3);
INSERT INTO ChatMessages VALUES (1);
INSERT INTO ChatMessages VALUES (1);
INSERT INTO ChatMessages VALUES (2);
Result:
SELECT * FROM Members;
+----------+--------------+
| MemberId | PointsEarned |
+----------+--------------+
| 1 | 23 |
| 2 | 10 |
| 3 | 3 |
+----------+--------------+
3 rows in set (0.00 sec)
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.