If you need to set the first table with aggregates from the second, you can put the aggregates in the select subquery, as you cannot do SET Table_A.col1 = SUM( ... ... <看更多>

This video shows the different methods that can be used to update from a select clause in SQL server, specifically how to update from a ... ... <看更多>

--Table A : 要Update / Insert 的Table --Table B : 要用來比較並取得相關資料的Table (或subQuery ) -- ON : 表你自訂條件, 用以判斷Matched 與否 ... <看更多>

This seems to work: Update companies c inner join (select a.id as company_id, sum(case when b.hot_tip = 1 then ... ... <看更多>