SQL内连接UPDATE查询跨表？

Question

两个表格，如下所示。

tbl-1
------
userid
teamid
teamname
elimimated


tbl-2
------
teamid
selectedteam

我想更新tbl-1.eliminated = 1如果tbl-2.selectedteam为空？如何在一个sql命令中实现这一点？

Answer 1

UPDATE tbl-1 SET eliminated=1 
WHERE teamid IN (
                    SELECT t2.teamid FROM tbl-2 AS t2
                    RIGHT JOIN tbl-1 AS t1
                    ON t2.teamid = t1.teamid
                    WHERE t2.selectedteam IS NULL
               );