檢查1：N層次結構保持在4個級別

Question

我在表中有5個層次的層次結構數據

1.BRANCH
2.LEGAL-ENTITY
3.REPORT-UNIT
4.REGIONAL
5.COUNTRY

我有一個表，其中包含包含分支作為主鍵的所有層次結構的記錄。 我需要檢查在高層層次結構到低層層次結構之間是否維持1：n的關系。

WHITEFIELD|BANGALORE|KARNATAKA|INDIA|APAC
WHITEFIELD|BANGALORE|MYSORE|INDIA|APAC - WRONG RECORD
MG ROAD|BANGALORE|KARNATAKA|INDIA|APAC
MG ROAD|NEW DELHI|DELHI|INDIA|APAC - WRONG RECORD
SILK BOARD|BANGALORE|KARNATAKA|INDIA|APAC
SILK BOARD|PUNE|MAHARASTRA|INDIA|APAC - WRONG RECORD

為此，我想編寫一個查詢，該查詢可以為我提供不滿足上述規則的記錄。

我已經寫了一個查詢，可以給出第4級和第5級的結果。

SELECT COD_BRNC,COUNT(DISTINCT COD_LEGL_ENTT) FROM TDI_GEO_BY_ORIGIN
WHERE COD_BRNC  NOT LIKE '%_D' AND YEAR(DAT_END_GEO_ORGN ) = 9999
GROUP BY COD_BRNC HAVING COUNT(DISTINCT COD_LEGL_ENTT) >  1

它給我

SILK BOARD|2
MG ROAD|2

Answer 1

您的第一個查詢是一個好的開始。 由於您沒有提供完整的表描述，因此我創建了自己的測試用例：

DROP TABLE level_5_test;

CREATE TABLE level_5_test( branch_id    VARCHAR2( 3 )
                     , level_1      VARCHAR2( 3 )
                     , level_2      VARCHAR2( 3 )
                     , level_3      VARCHAR2( 3 )
                     , level_4      VARCHAR2( 3 )
                     , description  VARCHAR2( 30 )
                      );

INSERT INTO level_5_test
 VALUES ( 'B0', 'L1', 'L2', 'L3', 'L4', 'No Problems' );

INSERT INTO level_5_test
 VALUES ( 'B1', 'L1', 'L2', 'L3', 'L4', 'Level 1 Problems' );

INSERT INTO level_5_test
     VALUES ( 'B1', 'E1', 'L2', 'L3', 'L4', 'Level 1 Problems' );

INSERT INTO level_5_test
     VALUES ( 'B2', 'L1', 'L2', 'L3', 'L4', 'Level 2 Problems' );

INSERT INTO level_5_test
     VALUES ( 'B2', 'L1', 'E2', 'L3', 'L4', 'Level 2 Problems' );

INSERT INTO level_5_test
     VALUES ( 'B3', 'L1', 'L2', 'L3', 'L4', 'Level 3 Problems' );

INSERT INTO level_5_test
     VALUES ( 'B3', 'L1', 'L2', 'E3', 'L4', 'Level 3 Problems' );

INSERT INTO level_5_test
     VALUES ( 'B4', 'L1', 'L2', 'L3', 'L4', 'Level 4 Problems' );

INSERT INTO level_5_test
     VALUES ( 'B4', 'L1', 'L2', 'L3', 'E4', 'Level 4 Problems' );

INSERT INTO level_5_test
     VALUES ( 'B5', 'L1', 'L2', 'L3', 'E4', 'Double Problems' );

INSERT INTO level_5_test
     VALUES ( 'B5', 'L1', 'E2', 'L3', 'L4', 'Double Problems' );

COMMIT;
--

獲得所有答案的最好方法是查詢所有字段，並添加count（distinct ...）的解析變體，在其中按branch_id進行分區：

WITH level_query
     AS (SELECT branch_id
              , level_1
              , level_2
              , level_3
              , level_4
              , description
              , COUNT( DISTINCT level_1 ) OVER (PARTITION BY branch_id)
                   AS level_1_count
              , COUNT( DISTINCT level_2 ) OVER (PARTITION BY branch_id)
                   AS level_2_count
              , COUNT( DISTINCT level_3 ) OVER (PARTITION BY branch_id)
                   AS level_3_count
              , COUNT( DISTINCT level_4 ) OVER (PARTITION BY branch_id)
               AS level_4_count
       FROM level_5_test)
SELECT *
  FROM level_query
 WHERE level_1_count > 1
    OR level_2_count > 1
    OR level_3_count > 1
    OR level_4_count > 1;

這適用於Oracle，但可能不適用於Hana。 然后，您必須將四個查詢與UNION ALL結合使用

SELECT   'L1' AS level_name
       , branch_id
    FROM level_5_test
GROUP BY branch_id
  HAVING COUNT( DISTINCT level_1 ) > 1
UNION ALL
SELECT   'L2' AS level_name
       , branch_id
    FROM level_5_test
GROUP BY branch_id
  HAVING COUNT( DISTINCT level_2 ) > 1
UNION ALL
SELECT   'L3' AS level_name
       , branch_id
    FROM level_5_test
GROUP BY branch_id
  HAVING COUNT( DISTINCT level_3 ) > 1
UNION ALL
SELECT   'L4' AS level_name
       , branch_id
    FROM level_5_test
GROUP BY branch_id
  HAVING COUNT( DISTINCT level_4 ) > 1
ORDER BY 2, 1;

第一個解決方案只需要一個全表掃描，第二個查詢需要四個表掃描，並且需要第五個FTS才能提供與第一個查詢一樣多的信息！