SQL where子句检查所有选定的列值是否在子查询中select

Question

下面的选择概念可以转换为sql select吗？

select S_ID from table1 where S_Type = TYPE and all S_ID in (select S_ID from table2)

其概念如下：

item1，item2和item3应该都在其中（从表中选择ITEMS）

如果所有S_ID都在其中，则select语句仅应返回一行（从表2中选择S_ID）

Answer 1

您需要先放置比较运算符

select S_ID from table1 where S_ID = ALL (select S_ID from table2)

Answer 2

如果要让S_ID的所有项都位于第二个表中，请使用聚合

select t1.S_ID
from table1 t1
where t1.S_Type = 'TYPE' and
      t1.item in (select t2.item from table2 t2)
group by S_ID
having count(distinct t1.item) = (select count(distinct t2.item) from table2 t2);