SQL Server - An expression of non-boolean type specified in a context where a condition is expected, near 'RETURN'

Question

Getting this error with the following query in SQL Server 2012.

An expression of non-boolean type specified in a context where a condition is expected, near 'RETURN'.

CREATE FUNCTION [dbo].[GetPMResources](@UserResourceNo nvarchar(250))

   RETURNS @Resources TABLE (
   ResourceNo nvarchar(250) COLLATE Latin1_General_CS_AS not null,
   Name nvarchar(250) COLLATE Latin1_General_CS_AS not null
   ) 
  AS
  BEGIN

        Declare @RoleID int, @UserDivision nvarchar(20)
        SELECT TOP(1) @RoleID = r.ReportingRole, @UserDivision = r.DivisionCode
        FROM Resource r 
        WHERE r.ResourceNo = @UserResourceNo



        INSERT @Resources
        SELECT r.ResourceNo,Name = r.ResourceNo + ' ' + r.Name
        FROM Resource r WHERE r.ResourceNo IN
                        ( 
                            SELECT m.ResourceNo FROM JobMember m
                            JOIN Job j ON j.JobNo = m.JobNo
                            WHERE j.ProjectManagerNo = @UserResourceNo 
                            OR
                            j.AlternateProjectManagerNo = @UserResourceNo
                        ) 
                        OR
                        (
                            SELECT m.ResourceNo FROM JobMember m
                            JOIN JobTask t ON t.JobTaskNo = m.JobTaskNo
                            WHERE t.TaskManagerNo = @UserResourceNo
                            OR
                            t.AlternateTaskManagerNo = @UserResourceNo
                        )                   
        RETURN 
  END

Answer 1

That is invalid syntax. You are mixing relational expressions with scalar operators (OR). Specifically you cannot combine expr IN (select ...) OR (select ...). You probably want expr IN (select ...) OR expr IN (select ...). Using union would also work: expr IN (select... UNION select...)