Question

I have two tables, both with a column called transaction_amnt. Is there a way I can write a SQL query that returns the sum of all of the transaction amounts in both tables? I tried

select sum(transaction_amnt) from table1 natural join table2;

but, I’m thinking that join isn’t really what I want here.

Answer 1

I guess union all best fits to your question as it will not remove duplicates on the records.

SELECT SUM(x.transaction_amnt) totalAmount
FROM
(
    SELECT transaction_amnt from table1
    UNION ALL
    SELECT transaction_amnt from table2
) x