Question

我有来自不同表格的以下数据集

Table1
-------
EMPID    DEPID   C1  C2  SUM
---------------------------
100      200     2    3   111
100      200     4    4   222

 Table2
-------
EMPID    DEPID   C1  C2  SUM
---------------------------
100      200     4    4   333
100      200     5    6   444

结果我正在寻找---

Table1
-------
EMPID    DEPID   T1.C1  T1.C2  T2.C1   T2.C2    T1.SUM   T2.SUM
--------------------------------------------------------------
100      200       2      3     NULL    NULL     111      NULL
100      200       4      4      4        4      222      333
100      200       NULL   NULL   5        6      NULL     444

任何帮助都很受欢迎。我使用了Full Outer Join但是无法实现这一点。

Answer 1

您希望INNER JOIN (emp_id, dep_id) FULL OUTER JOIN (c1, c2) FULL OUTER JOIN。我想你将无法在一个步骤中编写此连接条件。我提出了两步查询（SQL> WITH t1 AS ( 2 SELECT 100 emp_id, 200 dep_id, 2 c1, 3 c2, 111 sum FROM dual UNION ALL 3 SELECT 100 emp_id, 200 dep_id, 4 c1, 4 c2, 222 sum FROM dual 4 ), t2 AS ( 5 SELECT 100 emp_id, 200 dep_id, 4 c1, 4 c2, 333 sum FROM dual UNION ALL 6 SELECT 100 emp_id, 200 dep_id, 5 c1, 6 c2, 444 sum FROM dual UNION ALL 7 SELECT 100 emp_id, 300 dep_id, 7 c1, 8 c2, 555 sum FROM dual 8 ) 9 SELECT COALESCE(t1.emp_id, t2.emp_id) emp_id, 10 COALESCE(t1.dep_id, t2.dep_id) dep_id, 11 t1.c1, t1.c2, t2.c1, t2.c2, t1.sum, t2.sum 12 FROM t1 13 FULL OUTER JOIN t2 14 ON t1.emp_id = t2.emp_id 15 AND t1.dep_id = t2.dep_id 16 AND t1.c1 = t2.c1 17 AND t1.c2 = t2.c2 18 WHERE (COALESCE(t1.emp_id, t2.emp_id), COALESCE(t1.dep_id, t2.dep_id)) 19 IN (SELECT t1.emp_id, t1.dep_id 20 FROM t1 21 JOIN t2 ON t1.emp_id = t2.emp_id 22 AND t1.dep_id = t2.dep_id) 23 ORDER BY t1.c1; EMP_ID DEP_ID C1 C2 C1 C2 SUM SUM ---------- ---------- ---------- ---------- ---------- ---------- ---- ---- 100 200 2 3 111 100 200 4 4 4 4 222 333 100 200 5 6 444后跟过滤子查询）。

T2

请注意，我在您的示例的INNER JOIN中添加了一行，以演示{{1}}。

完全外部加入Oracle

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