您可以简单地将表联接到进行一些计算的子查询中，

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