Check 1:N hierarchy is maintained at 4 levels - sql

Question

I have hierarchy level data of 5 levels in a table
1.BRANCH
2.LEGAL-ENTITY
3.REPORT-UNIT
4.REGIONAL
5.COUNTRY
I have a table which contain records containing all the hierarchy with Branch as the Primary Key.
I need to check if the relationship of 1:n is maintained between higher level hierarchy to low level hierarchy.
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
To achieve this, I want to write one query which can give me records which are not satisfying the above rule.
I have already written a query which can give the result for 4th and 5th level.
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
It gives me
SILK BOARD|2
MG ROAD|2

Answer 1

Your first query is a good start.
As you did not give a complete Table description I created my own testcase:
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;
--
The best way to get all the answers is by querying all fields and adding the analytic variations of count(distinct...) where you partition by the branch_id:
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;
This works for Oracle, but might not work (yet) for Hana. Then you have to combine four queries with UNION ALL
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;
The first solution needs only one full table scan, the second query needs four and would need a fifth FTS to give as much information as the first!