Sql server 有点'；标量积'；在SQL Server中

我有这两个临时表，正在尝试构造一个select，返回以下结果：

1 W  A
1 X  -
2 Y  B
2 -  C
3 Z  D
3 Z2 E
3 -  F

以下是我的临时表的定义：

CREATE TABLE #T1 (a INT, b VARCHAR(50))
CREATE TABLE #T2 (a INT, b VARCHAR(50))

INSERT INTO #T1 (a, b)
VALUES (1, 'W'), (1, 'X'), (2, 'Y'), (3, 'Z'), (3, 'Z2')

INSERT INTO #T2 (a, b)
VALUES (1, 'A'), (2, 'B'), (2, 'C'), (3, 'D'), (3, 'E'), (3, 'F')

SELECT * FROM #T1
SELECT * FROM #T2

DROP TABLE #T1
DROP TABLE #T2

我不知道我可以使用哪种加入方式！尝试了几个，但没有得到预期的结果

我正在使用SQL Server 2012

---

提前谢谢

使用

完全外部连接

SELECT COALESCE(t1.a, t2.a),
       ISNULL(t1.b,'-'),
       ISNULL(t2.b,'-')
FROM   (SELECT Row_number()OVER(partition BY a ORDER BY b) AS rn,*
        FROM   #T1) t1
       FULL OUTER JOIN (SELECT Row_number()OVER(partition BY a ORDER BY b) AS rn,*
                        FROM   #T2) t2
                    ON t1.a = t2.a
                       AND t1.rn = t2.rn 

---

您可以将

外部联接

与

行编号

结合使用：

WITH t1 AS (
    SELECT *, ROW_NUMBER() OVER(PARTITION BY a ORDER BY b) AS rn
    FROM #t1
), t2 AS (
    SELECT *, ROW_NUMBER() OVER(PARTITION BY a ORDER BY b) AS rn
    FROM #t2
)
SELECT COALESCE(t1.a, t2.a) AS a,  t1.b,    t2.b
FROM t1
FULL JOIN t2
  ON t1.a = t2.a
 AND t1.rn = t2.rn;

---

@lad2025-是的。。没有很好地检查它我想你想要的是

ISNULL

而不是

NULLIF

：）@lad2025-我应该睡觉了我想：“

Y

为什么在结果中出现两次？重复的值是否应该显示为

-

？”？