Question

I have a query that looks like this:

SELECT * 
FROM dbo.document_library_file_attributes 
WHERE my_file_id=
(SELECT my_file_id 
 FROM dbo.document_library_file_attributes 
 WHERE attribute_name='Directory/Key' AND attribute_value LIKE @directory+'%')

I want to the subquery to be able to return multiple results, meaning my_file_id could equal ‘directoryA’, ‘directoryB’, and I want the results for all of these. How would I do that?

Answer 1

Use IN instead of = for result sets:

SELECT * 
FROM dbo.document_library_file_attributes 
WHERE my_file_id IN
(SELECT my_file_id 
 FROM dbo.document_library_file_attributes 
 WHERE attribute_name='Directory/Key' AND attribute_value LIKE @directory+'%')

It:

Determines whether a specified value matches any value in a subquery or a list.