sql server 2008中具有外部/左侧联接的分组依据

我在表1中有如下数据：

UserID CourseID TestID   Result
1         1       1        P
1         1       2        P
2         1       1        F
2         1       2        F

这表明有2个用户（UserID=1和2）在CourseID=1中进行了测试（TestID=1和2）

现在CourseID总共有3个测试（假设TestID=1,2,7），如下所示：

这意味着没有用户参加过测试（TestID=7）show now我想如下所示显示数据

UserID CourseID TestID   Result
1         1       1        P
1         1       2        P
1         1       7        null
2         1       1        F
2         1       2        F
2         1       7        null

我一直在尝试使用Group by的左/右外部联接，但未能获得预期的结果。如何实现它？

SELECT uct.UserId, ct.CourseID, ct.TestID, uct.Result
FROM CourseTest ct
LEFT JOIN UserCourseTest uct ON uct.CourseID=ct.CourseID AND uct.TestID=ct.TestID

MS SQL Server 2008架构设置：

create table Result
(
  UserID int,
  CourseID int,
  TestID int,
  Result char(1)
)
insert into Result values
(1,         1,       1,        'P'),
(1,         1,       2,        'P'),
(2,         1,       1,        'F'),
(2,         1,       2,        'F')

create table Course
(
  CourseID int,
  TestID int
)

insert into Course values
(1, 1),
(1, 2),
(1, 7)

select U.UserID,
       C.CourseID,
       C.TestID,
       R.Result
from (
     select distinct UserID
     from Result
     ) as U
  cross apply Course as  C
  left outer join Result as R
    on R.CourseID = C.CourseID and
       R.TestID = C.TestID and
       R.UserID = U.UserID

| USERID | COURSEID | TESTID | RESULT |
---------------------------------------
|      1 |        1 |      1 |      P |
|      1 |        1 |      2 |      P |
|      1 |        1 |      7 | (null) |
|      2 |        1 |      1 |      F |
|      2 |        1 |      2 |      F |
|      2 |        1 |      7 | (null) |

查询1：

create table Result
(
  UserID int,
  CourseID int,
  TestID int,
  Result char(1)
)
insert into Result values
(1,         1,       1,        'P'),
(1,         1,       2,        'P'),
(2,         1,       1,        'F'),
(2,         1,       2,        'F')

create table Course
(
  CourseID int,
  TestID int
)

insert into Course values
(1, 1),
(1, 2),
(1, 7)

select U.UserID,
       C.CourseID,
       C.TestID,
       R.Result
from (
     select distinct UserID
     from Result
     ) as U
  cross apply Course as  C
  left outer join Result as R
    on R.CourseID = C.CourseID and
       R.TestID = C.TestID and
       R.UserID = U.UserID

| USERID | COURSEID | TESTID | RESULT |
---------------------------------------
|      1 |        1 |      1 |      P |
|      1 |        1 |      2 |      P |
|      1 |        1 |      7 | (null) |
|      2 |        1 |      1 |      F |
|      2 |        1 |      2 |      F |
|      2 |        1 |      7 | (null) |

：

create table Result
(
  UserID int,
  CourseID int,
  TestID int,
  Result char(1)
)
insert into Result values
(1,         1,       1,        'P'),
(1,         1,       2,        'P'),
(2,         1,       1,        'F'),
(2,         1,       2,        'F')

create table Course
(
  CourseID int,
  TestID int
)

insert into Course values
(1, 1),
(1, 2),
(1, 7)

select U.UserID,
       C.CourseID,
       C.TestID,
       R.Result
from (
     select distinct UserID
     from Result
     ) as U
  cross apply Course as  C
  left outer join Result as R
    on R.CourseID = C.CourseID and
       R.TestID = C.TestID and
       R.UserID = U.UserID

| USERID | COURSEID | TESTID | RESULT |
---------------------------------------
|      1 |        1 |      1 |      P |
|      1 |        1 |      2 |      P |
|      1 |        1 |      7 | (null) |
|      2 |        1 |      1 |      F |
|      2 |        1 |      2 |      F |
|      2 |        1 |      7 | (null) |

注意：如果您有一个表

Users

，则可以替换派生表

 (
 select distinct UserID
 from Result
 ) as U

---

将

用户改为U

。

其sql server 2008 R2i以前曾尝试过此方法，但未显示正确的结果，本例中的输出为-UserID CourseID TestID Result 1 1 1 P 1 2 P 2 1 1 F 2 1 2 F null 1 7 null类似于上述内容我看到了问题，需要与用户表r“选择不同的UserID”派生表连接。虽然即将上床睡觉，但是.似乎工作正常，只是最后一行的一点-R.UserID=C.TestID不应该是R.UserID=U.UserID？@user1509581应该是U.UserID