SQL Server:检查其他表中是否存在所有行

Question

我需要知道一个表中的所有行是否都存在于其他表中:

declare @Table1 table (id int)
declare @Table2 table (id int)

insert into @Table1(id) values (1)
insert into @Table1(id) values (4)
insert into @Table1(id) values (5)


insert into @Table2(id) values (1)
insert into @Table2(id) values (2)
insert into @Table2(id) values (3)

if exists (select id from @Table1 where id in (select id from @Table2))
    select 'yes exists'
else
    select 'no, doesn''t exist' 

此查询返回yes exists但应返回,no, doesn't exist因为只存在1 @Table2,值4和5不存在.

我的查询应该更改什么？谢谢!

Answer 1

IF NOT EXISTS (
    SELECT ID FROM @Table1
    EXCEPT
    SELECT ID FROM @Table2
)
SELECT 'yes exists'
ELSE SELECT 'no, doesn''t exist'