Question

I have 2 table with the same column in each

Can I create a query that will join the 2 tables and give me the max between the 2

I came up with

SELECT MAX(certificate_number) AS max FROM contacts_cstm
UNION
SELECT MAX(certificate_number) AS max FROM accounts_cstm

But this gives me the max value from each. How can I modify this query to give me the max between the both of them

Thanks

Answer 1

Wrapping with another query will do the trick:

SELECT MAX(certificate_number) AS max
FROM (
    SELECT certificate_number FROM contacts_cstm
    UNION
    SELECT certificate_number FROM accounts_cstm
) as CHILD