Question

I am trying to update multiple rows in one table, based on a select statement on another table.

This is my query:

UPDATE dbo.[user_message_content]
SET [status] = 1
WHERE [message_id] = (SELECT [message_id] FROM dbo.[user_message] WHERE [receiver_id] = @userID)
AND [status] = 0

This select statement may return multiple rows, which leads me to this error:

Msg 512, Level 16, State 1, Procedure usp_profileUserMessageMarkAsRead, Line 11
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

What is the correct way to achieve what I need?

Thanks very much

Answer 1

If you want to update all those records, change the = to IN:

UPDATE dbo.[user_message_content]
SET [status] = 1
WHERE [message_id] IN 
    ( SELECT [message_id] FROM dbo.[user_message] WHERE [receiver_id] = @userID )
AND [status] = 0