C# 用于筛选多对多关系的SQL查询

我有一个多对多关系的表

USER
-----
Id


CASE
----
Id
Created

Users_Cases
------------
UserId
CaseId

您能帮我找出sql查询来获取在2015年10月14日之前创建案例的用户吗？谢谢

编辑：如果用户有2个案例，并且第一个案例是在日期之前创建的，另一个是在日期之后创建的，则结果中不应包含该用途

User
User1
User2
User3

Case
Case1 - 9/14/2015
Case2 - 11/14/2015
Case3 - 12/14/2015
Case4 - 8/15/2015

Users_Cases
User1 - Case1
User1 - Case2
User2 - Case3
User3 - Case4

预期结果：只有User3。User1有一个case<小于日期，但还有另一个case>=日期，因此结果中不包括User1

SELECT *
FROM "user" u
INNER JOIN "Users_Cases" uc ON u.id = uc.UserId
INNER JOIN "CASE" c ON uc.CaseId = c.id WHERE c.Created < '10/14/2015'

或

编辑：根据OP的评论

SELECT *
FROM "user"
WHERE id IN (
        SELECT uc.UserId
        FROM "case" c
        INNER JOIN "Users_Cases" uc ON uc.CaseId = c.id
        WHERE c.Created < '10/14/2015'
        )

---

可能这应该是可行的，因为我认为您希望排除在指定日期之后创建案例的用户

Select * from User as A
    inner join UserCases as B on A.ID = B.UserID
    inner join case as C on B.CaseID = C.ID
Where C.Created <= @GivenDate
    and A.ID not in (Select UserID from User_cases as D 
                inner join case as E on D.CaseID = E.ID
                Where E.Created >= @GivenDate
            )

如果只需要一个ID，请使用GROUPBY子句

Select A.ID from User as A
    inner join UserCases as B on A.ID = B.UserID
    inner join case as C on B.CaseID = C.ID
Where C.Created <= @GivenDate
    and A.ID not in (Select UserID from User_cases as D 
                inner join case as E on D.CaseID = E.ID
                Where E.Created >= @GivenDate
            )
 group by A.ID

---

谢谢，但是我忘记了一个条件，如果假设用户有两个案例，第一个案例是在日期之前创建的，另一个是在日期之后创建的，那么结果中不应该包括使用。我将如何修改上述查询？结果中不应包含的用途是什么？？我不能很好地理解您，只需显示示例输入和预期输出，就足以快速理解用户1用户2用户3案例1-9/14/2015案例2-11/14/2015案例3-12/14/2015案例4-8/15/2015用户\u案例用户1-Case1用户1-Case2用户2-Case3用户3-Case4预期结果：仅用户3。User1的案例<小于日期，但另一个案例>=日期，因此结果中不包括User1。您的查询提供了在指定日期之前提出案例的用户列表。。。但我认为OP希望从列表中排除在指定日期后提交票证的用户。。。

Select A.ID from User as A
    inner join UserCases as B on A.ID = B.UserID
    inner join case as C on B.CaseID = C.ID
Where C.Created <= @GivenDate
    and A.ID not in (Select UserID from User_cases as D 
                inner join case as E on D.CaseID = E.ID
                Where E.Created >= @GivenDate
            )
 group by A.ID

SELECT U.*
FROM `USER` AS U
WHERE EXISTS (SELECT 1 FROM `Users_Cases` AS UC 
          INNER JOIN `case` AS C ON UC.CaseId=C.`id`
          WHERE UC.UserId=U.`id` 
          AND C.`Created`<'2015-10-14'
)