在sql-server 2008中联接两个表

Question

我有两个表：

表A：

Id (int), TypeA (varchar(25))
  1        a
  2        Null
  3        b
  4        c
  5        d
  6        v

表B：

Id (int), TypeB (varchar(25))
  2        A
  3        C
  4        null
  5        E
  7        S

结果应为：

Id (int), TypeA (varchar(25)), TypeB (varchar(25))
  1         a                   Null
  2         Null                A   
  3         b                   C
  4         c                   Null
  5         d                   E
  6         v                   Null
  7         Null                S

任何想法？ 谢谢

Answer 1

您可以尝试一下，这是质量较低的答案，但可以肯定地帮助您解决问题。

SELECT ID,TypeA, TypeB FROM (
    SELECT A.ID, A.TypeA, B.TypeB FROM TableA AS A LEFT JOIN TableB AS B ON A.ID = B.ID 
    UNION
    SELECT B.ID, A.TypeA, B.TypeB FROM TableA AS A RIGHT JOIN TableB AS B ON A.ID = B.ID
) AS TableTemp
GROUP BY ID,TypeA, TypeB

Answer 2

使用此代码：

CREATE TABLE #t1 (id INT, NAME VARCHAR(25))
CREATE TABLE #t2 (id INT, NAME VARCHAR(25))
insert into #t1 values(1,'a')
insert into #t1 values(2,NULL)
insert into #t1 values(3,'b')
insert into #t1 values(4,'c')
insert into #t1 values(5,'d')
insert into #t1 values(6,'v')

insert into #t2 values(2,'A')
insert into #t2 values(3,'C')
insert into #t2 values(4,NULL)
insert into #t2 values(5,'E')
insert into #t2 values(7,'S')


select * from #t1
select * from #t2


select a.name,b.name from #t1 a
FULL OUTER JOIN #t2 b
ON a.id=b.id

结果：

name    name
a      NULL
NULL    A
b       C
c      NULL
d       E
v      NULL
NULL    S