Update multiple columns from subquery

Question

This type of thing has been asked a few times before, but is not quite what I am looking for. I need to SET two rows equal to different parts of a subquery.

I am currently using:

UPDATE records
SET leads=(SELECT COUNT(*) FROM leads_table WHERE leads_table.blah=records.blah),
earnings=(SELECT SUM(amount) FROM leads_table WHERE leads_table.blah=records.blah)

The WHERE statements were obviously simplified...but basically its the same subquery but I don't think I should be running it twice?

I want to do something like...

UPDATE records
SET (leads,earnings)=(SELECT COUNT(*),SUM(amount) FROM leads_table WHERE leads_table.blah=records.blah)

Answer 1

You can simply join the table in a subquery that do some calculations,

UPDATE  records a
        INNER JOIN
        (
            SELECT  blah, 
                    COUNT(*) totalCount,
                    SUM(amount) totalSum
            FROM    leads_table
            GROUP   BY blah
        ) b ON  b.blah = a.blah
SET     a.leads = b.totalCount
        a.earnings = b.totalSum