Question

I have 2 tables: #tmptable1 and #tmptable2. These tables have an ID to uniquely identify each record.

I want to return all records from table 1, but I only want to return the records from table 2 that aren’t in table 1

I want this done in 1 query.

Thanks!

Answer 1

SELECT * FROM '#tmptable1' 
UNION ALL
SELECT * FROM  '#tmptable2' WHERE 
    ID NOT IN (SELECT ID FROM #tmptable1 WHERE ID IS NOT NULL)