跨表的SQL内部联接更新查询？

Question

两张桌子如下所示。

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


tbl-2
------
teamid
selectedteam

如果tbl-2选择团队为空，我想更新tbl-1已消除=1？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
               );