The lookup SQL override is similar to entering a custom query in a Source Qualifier transformation. You can override the lookup query for a relational lookup. You can enter the entire override, or you can generate and edit the default SQL statement. When the Designer generates the default SQL statement for the lookup SQL override, it includes the lookup/output ports in the lookup condition and the lookup/return port.
You can enter a different lookup query or edit the existing lookup query, which includes the lookup ports, output ports, and the return port.