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Error: "Subquery returned more than 1 value"

Issue:​

Your subquery column returned an error stating that it returned more than one value.

Cause:​

Rapid is unable to determine a top single result to return. Instead, it is returning multiple items at once and will crash.

Example:​

SELECT [id]
FROM dbo.[contact]
-- ERROR --
-- Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <=, >, >= or when the subquery is used as an expression.

Solution 1: Force the return of a single result​

The following code returns the ID of the newest item on the contact table

SELECT TOP 1 c.[id]
FROM dbo.[contact] AS c
ORDER BY [created] DESC

Solution 2. Bind the result to a specific ID​

This solution requires a lookup column to exist on this table (e.g. t.[contact_id]) that contains a foreign key to another table (e.g. c.[id]).

SELECT c.[id]
FROM dbo.[contact] AS c
WHERE c.[id] = t.[contact_id]