完全加入羣組

Question

我面臨着我的查詢的邏輯問題。

我有兩個表Table1和Table2，其中Table1組成：

• value要被總計
• Id由
• Code被分組持有外國關鍵Table2

而且Table2由

• Code
• Des的代碼

我試圖做的是文字說明，由Table1.Id組成，完全加入Table2.Code，但是，f或每個結果組，我希望顯示查詢生成的每個組的Table2中的所有行。

示例代碼：

SELECT 
    Table2.Code, Table1.Id, Table2.DES, 
    SUM(Table1.Value) AS SUM_VAL 
FROM 
(
    SELECT 'A' AS Code, 1 AS Id, 10 AS Value FROM DUAL UNION 
    SELECT 'A' AS Code, 2 AS Id, 20 AS Value FROM DUAL UNION 
    SELECT 'B' AS Code, 1 AS Id, 10 AS Value FROM DUAL UNION 
    SELECT 'B' AS Code, 1 AS Id, 30 AS Value FROM DUAL UNION 
    SELECT 'B' AS Code, 2 AS Id, 50 AS Value FROM DUAL UNION 
    SELECT 'C' AS Code, 1 AS Id, 40 AS Value FROM DUAL UNION 
    SELECT 'C' AS Code, 2 AS Id, 60 AS Value FROM DUAL UNION 
    SELECT 'D' AS Code, 1 AS Id, 20 AS Value FROM DUAL 

) Table1 
FULL JOIN 
(
    SELECT 'A' AS Code, 'This is A' AS DES FROM DUAL UNION 
    SELECT 'B' AS Code, 'This is B' AS DES FROM DUAL UNION 
    SELECT 'C' AS Code, 'This is C' AS DES FROM DUAL UNION 
    SELECT 'D' AS Code, 'This is D' AS DES FROM DUAL 
) Table2 
ON Table1.Code = Table2.Code 
GROUP BY 
    Table2.Code, Table1.Id, Table2.DES 
ORDER BY 
    Table2.Code, Table1.Id ASC 

結果：

A 1 This is A 10 
A 2 This is A 20 
B 1 This is B 40 
B 2 This is B 50 
C 1 This is C 40 
C 2 This is C 60 
D 1 This is D 20 

要求的結果：

A 1 This is A 10 
A 2 This is A 20 
B 1 This is B 40 
B 2 This is B 50 
C 1 This is C 40 
C 2 This is C 60 
D 1 This is D 20 
D 2 This is D 0 <- This is the target 

Answer 1

你總得有顯示價值對(D,2)例如。通過與可能值的碼列表和平移NULL到0：

SELECT code.code, 
     code.id, 
     des.des, 
     NVL (SUM (val.value), 0) sum_val 
    FROM (SELECT 'A' code, 1 id FROM DUAL 
      UNION 
      SELECT 'A', 2 FROM DUAL 
      UNION 
      SELECT 'B', 1 FROM DUAL 
      UNION 
      SELECT 'B', 2 FROM DUAL 
      UNION 
      SELECT 'C', 1 FROM DUAL 
      UNION 
      SELECT 'C', 2 FROM DUAL 
      UNION 
      SELECT 'D', 1 FROM DUAL 
      UNION 
      SELECT 'D', 2 FROM DUAL) code 
     INNER JOIN (SELECT 'A' code, 'This is A' des FROM DUAL 
        UNION 
        SELECT 'B', 'This is B' FROM DUAL 
        UNION 
        SELECT 'C', 'This is C' FROM DUAL 
        UNION 
        SELECT 'D', 'This is D' FROM DUAL) des 
      ON code.code = des.code 
     LEFT OUTER JOIN (SELECT 'A' code, 1 id, 10 VALUE FROM DUAL 
          UNION ALL 
          SELECT 'A', 2, 20 FROM DUAL 
          UNION ALL 
          SELECT 'B', 1, 10 FROM DUAL 
          UNION ALL 
          SELECT 'B', 1, 30 FROM DUAL 
          UNION ALL 
          SELECT 'B', 2, 50 FROM DUAL 
          UNION ALL 
          SELECT 'C', 1, 40 FROM DUAL 
          UNION ALL 
          SELECT 'C', 2, 60 FROM DUAL 
          UNION ALL 
          SELECT 'D', 1, 20 FROM DUAL) val 
      ON code.code = val.code AND code.id = val.id 
GROUP BY code.code, code.id, des.des 
ORDER BY code, id 

UNION ALL在val使用，因爲重複的可能發生。

不需要FULL OUTER JOIN。

Answer 2

如果你想ID和值的所有組合，然後使用cross join得到行和left join在其餘值帶來：

select t2.code, i.value, t2.desc, coalesce(cnt, 0) as cnt 
from (select distinct id from table1) i cross join 
    table2 t2 left join 
    (select id, value, count(*) as cnt 
     from table1 
     group by id, value 
    ) iv 
    on iv.id = i.id and iv.code = t2.code 

這應該是超過了所有上市更簡單手動組合。

Answer 3

SELECT 
    Table2.Code, Table2.NAT, Table2.DES, 
    SUM(Table1.Value) AS SUM_VAL 
FROM 
(
    SELECT 'A' AS Code, 'QA' AS Id, 10 AS Value FROM DUAL UNION 
    SELECT 'A' AS Code, 'NQA' AS Id, 20 AS Value FROM DUAL UNION 
    SELECT 'B' AS Code, 'QA' AS Id, 10 AS Value FROM DUAL UNION 
    SELECT 'B' AS Code, 'QA' AS Id, 30 AS Value FROM DUAL UNION 
    SELECT 'B' AS Code, 'NQA' AS Id, 50 AS Value FROM DUAL UNION 
    SELECT 'C' AS Code, 'QA' AS Id, 40 AS Value FROM DUAL UNION 
    SELECT 'C' AS Code, 'NQA' AS Id, 60 AS Value FROM DUAL UNION 
    SELECT 'D' AS Code, 'QA' AS Id, 20 AS Value FROM DUAL 

) Table1 
FULL JOIN 
(
    SELECT 'QA' NAT,'A' AS Code, 'This is A' AS DES FROM DUAL UNION 
    SELECT 'QA' NAT,'B' AS Code, 'This is B' AS DES FROM DUAL UNION 
    SELECT 'QA' NAT,'C' AS Code, 'This is C' AS DES FROM DUAL UNION 
    SELECT 'QA' NAT,'D' AS Code, 'This is D' AS DES FROM DUAL 
    UNION 
    SELECT 'NQA' NAT,'A' AS Code, 'This is A' AS DES FROM DUAL UNION 
    SELECT 'NQA' NAT,'B' AS Code, 'This is B' AS DES FROM DUAL UNION 
    SELECT 'NQA' NAT,'C' AS Code, 'This is C' AS DES FROM DUAL UNION 
    SELECT 'NQA' NAT,'D' AS Code, 'This is D' AS DES FROM DUAL 
) Table2 
on TABLE2.NAT = TABLE1.ID 
     AND Table2.Code= Table1.Code 
GROUP BY 
    Table2.Code, Table2.NAT, Table2.DES 
ORDER BY 
    Table2.Code, Table2.NAT ASC