SQL Server：检查其他表中是否存在所有行

I need to know if all rows from one table exists in other:

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'

This query returns yes exists but should return no, doesn't exist because only 1 exists in @Table2, values 4 and 5 don't.

此查询返回yes存在，但应返回no，不存在，因为@ Table2中只存在1，值4和5不存在。

What should I change in my query? Thanks!

我的查询应该更改什么？谢谢！

4 个解决方案

#1

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

#2

You could use EXCEPT to get the set difference of both tables. If any ID's are returned, both tables are not equal:

您可以使用EXCEPT来获取两个表的设置差异。如果返回任何ID，则两个表不相等：

SELECT ID
FROM @Table1
EXCEPT 
SELECT ID
FROM @Table2

EXCEPT returns any distinct values from the left query that are not also found on the right query.

EXCEPT返回左查询中的任何不同值，这些值在右侧查询中也找不到。

So, to get your "no, doesnt exist":

所以，要得到你的“不，不存在”：

;WITH diff AS(
    SELECT ID
    FROM @Table1
    EXCEPT 
    SELECT ID
    FROM @Table2
)
SELECT CASE WHEN COUNT(diff.ID) = 0 
         THEN 'yes exists'
         ELSE 'no, doesnt exist'
         END AS Result
FROM diff

#3

select case when count(*) > 0 then 'no' else 'yes' end as AllExist
from @Table1 t1
left outer join @Table2 t2 on t1.id = t2.id
where t2.id is null

#4

This would work as long as both id columns are unique (which they should be if they are id's)

只要两个id列都是唯一的（如果它们是id，它们应该是这样的），这将起作用

DECLARE @totalRows int;
SET @totalRows = SELECT count(*) from Table1;

RETURN (@totalRows == SELECT count(*) from Table1 JOIN Table2 on Table1.id = Table2.id)

#1

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

#2