如何在mongodb中实现select * from a，b，c where a，a1 =b，b1 and b，b1=c，c1的查询
2024-12-01 17:39:28
推荐回答（1个）
回答1：
update table t1 set (t1.b, t1.c) = (select t2.b1, t2.c1 from table1 t2 where t1.a = t2.a1) where exists (select 1 from from table1 t2 where t1.a = t2.a1)
