SQL Server Subquery returned more than 1 value. This is not permitted when the subquery follows (chars) or when the subquery is used as an expression

Question

I am trying to update some fields based on their occurence. If they only occur one time, I am updating some status field.

My current code is as follows:

Answer 1

Try this

Use Top

UPDATE table1
SET statusField = 1
WHERE someID = (
               SELECT TOP 1 someID
               FROM table1
               GROUP BY someID HAVING COUNT(*) = 1
               )

Or you can use IN clause

UPDATE table1
SET statusField = 1
WHERE someID IN (
               SELECT someID
               FROM table1
               GROUP BY someID HAVING COUNT(*) = 1
               )