Mysql- update row from one table based on distinct value from another table
I have a table Users which has a column MemberID
There is another table called UserMembers, this table have for same users multiple MemberID's.
Now, I need to populate the Users table MemberID with only 1 value from UserMembers table, so if it has 3 value I want the minimum value.
I tried
UPDATE Users
SET MemberID = (SELECT DISTINCT m.MemberID FROM UserMembers
um INNER join Users u on um.UserID = u.UserID
ORDER BY um.CreatedDT ASC LIMIT 1);
But this is not the right query. Any help would be appreciated
mysql
asked Nov 20 at 20:04
crystal2515
82
add a comment |
I have a table Users which has a column MemberID
There is another table called UserMembers, this table have for same users multiple MemberID's.
Now, I need to populate the Users table MemberID with only 1 value from UserMembers table, so if it has 3 value I want the minimum value.
I tried
UPDATE Users
SET MemberID = (SELECT DISTINCT m.MemberID FROM UserMembers
um INNER join Users u on um.UserID = u.UserID
ORDER BY um.CreatedDT ASC LIMIT 1);
But this is not the right query. Any help would be appreciated
mysql
asked Nov 20 at 20:04
crystal2515
82
add a comment |
I have a table Users which has a column MemberID
There is another table called UserMembers, this table have for same users multiple MemberID's.
Now, I need to populate the Users table MemberID with only 1 value from UserMembers table, so if it has 3 value I want the minimum value.
I tried
UPDATE Users
SET MemberID = (SELECT DISTINCT m.MemberID FROM UserMembers
um INNER join Users u on um.UserID = u.UserID
ORDER BY um.CreatedDT ASC LIMIT 1);
But this is not the right query. Any help would be appreciated
mysql
asked Nov 20 at 20:04
crystal2515
82
I have a table Users which has a column MemberID
There is another table called UserMembers, this table have for same users multiple MemberID's.
Now, I need to populate the Users table MemberID with only 1 value from UserMembers table, so if it has 3 value I want the minimum value.
I tried
UPDATE Users
SET MemberID = (SELECT DISTINCT m.MemberID FROM UserMembers
um INNER join Users u on um.UserID = u.UserID
ORDER BY um.CreatedDT ASC LIMIT 1);
But this is not the right query. Any help would be appreciated
mysql
mysql
asked Nov 20 at 20:04
crystal2515
82
asked Nov 20 at 20:04
crystal2515
82
asked Nov 20 at 20:04
crystal2515
82
asked Nov 20 at 20:04
crystal2515
82
asked Nov 20 at 20:04
crystal2515
82
82
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
In a Derived Table, you can get the minimum value of MemberID for every UserID from the UserMembers table. Join this to the Users table using UserID, and set this minimum value in the Users table.
UPDATE Users AS u
JOIN
(SELECT UserID, MIN(MemberID) AS minMemberID
FROM UserMembers
GROUP BY UserID
) AS dt
ON dt.UserID = u.UserID
SET u.MemberID = dt.minMemberID
answered Nov 20 at 20:08
Madhur Bhaiya
19.4k62236
1
Thank u so much. It worked like a charm
– crystal2515
Nov 20 at 21:44
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
In a Derived Table, you can get the minimum value of MemberID for every UserID from the UserMembers table. Join this to the Users table using UserID, and set this minimum value in the Users table.
UPDATE Users AS u
JOIN
(SELECT UserID, MIN(MemberID) AS minMemberID
FROM UserMembers
GROUP BY UserID
) AS dt
ON dt.UserID = u.UserID
SET u.MemberID = dt.minMemberID
answered Nov 20 at 20:08
Madhur Bhaiya
19.4k62236
1
Thank u so much. It worked like a charm
– crystal2515
Nov 20 at 21:44
add a comment |
In a Derived Table, you can get the minimum value of MemberID for every UserID from the UserMembers table. Join this to the Users table using UserID, and set this minimum value in the Users table.
UPDATE Users AS u
JOIN
(SELECT UserID, MIN(MemberID) AS minMemberID
FROM UserMembers
GROUP BY UserID
) AS dt
ON dt.UserID = u.UserID
SET u.MemberID = dt.minMemberID
answered Nov 20 at 20:08
Madhur Bhaiya
19.4k62236
1
Thank u so much. It worked like a charm
– crystal2515
Nov 20 at 21:44
add a comment |
In a Derived Table, you can get the minimum value of MemberID for every UserID from the UserMembers table. Join this to the Users table using UserID, and set this minimum value in the Users table.
UPDATE Users AS u
JOIN
(SELECT UserID, MIN(MemberID) AS minMemberID
FROM UserMembers
GROUP BY UserID
) AS dt
ON dt.UserID = u.UserID
SET u.MemberID = dt.minMemberID
answered Nov 20 at 20:08
Madhur Bhaiya
19.4k62236
In a Derived Table, you can get the minimum value of MemberID for every UserID from the UserMembers table. Join this to the Users table using UserID, and set this minimum value in the Users table.
UPDATE Users AS u
JOIN
(SELECT UserID, MIN(MemberID) AS minMemberID
FROM UserMembers
GROUP BY UserID
) AS dt
ON dt.UserID = u.UserID
SET u.MemberID = dt.minMemberID
answered Nov 20 at 20:08
Madhur Bhaiya
19.4k62236
answered Nov 20 at 20:08
Madhur Bhaiya
19.4k62236
answered Nov 20 at 20:08
Madhur Bhaiya
19.4k62236
answered Nov 20 at 20:08
Madhur Bhaiya
19.4k62236
19.4k62236
1
Thank u so much. It worked like a charm
– crystal2515
Nov 20 at 21:44
add a comment |
1
Thank u so much. It worked like a charm
– crystal2515
Nov 20 at 21:44
1
1
Thank u so much. It worked like a charm
– crystal2515
Nov 20 at 21:44
Thank u so much. It worked like a charm
– crystal2515
Nov 20 at 21:44
add a comment |
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