从SQL Server中的2个不同表更新ID

Question

我有3张桌子：

• t1：id，m_id，date
• t2：p_id，p_code
• t3：p_id，p_code，event_id

如何更新t1中的ID？

where id in (select p_id from t2 inner join t3 on t2.p_code = t3.p_code)

Answer 1

UPDATE t1
SET id = (SELECT TOP 1 t2.p_id
            FROM t2 INNER JOIN t3
            WHERE t2.p_code = t3.p_code)
WHERE <conditon> -- choose rows to update