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SQL Puzzle | Find Grand Parent, Parent and Child Puzzle ( Parent/Child relationship tree between Range )
In this puzzle the requirement is to generate the range and level column. E.g. 1-100 is grandfather RANGE is 0 and level is 1, 2-50 is the 1st son so range column value will be 144 and level will be 1 and so on..
Please check out the sample input values and sample expected output below.
Sample Input
id | start_value | end_vaule | range | level |
---|---|---|---|---|
144 | 1 | 100 | NULL | NULL |
145 | 2 | 50 | NULL | NULL |
146 | 8 | 25 | NULL | NULL |
147 | 51 | 70 | NULL | NULL |
148 | 57 | 60 | NULL | NULL |
164 | 200 | 250 | NULL | NULL |
172 | 201 | 225 | NULL | NULL |
174 | 201 | 213 | NULL | NULL |
188 | 310 | 350 | NULL | NULL |
192 | 325 | 350 | NULL | NULL |
194 | 333 | 333 | NULL | NULL |
Expected Output
id | start_value | end_vaule | range | level |
---|---|---|---|---|
144 | 1 | 100 | 0 | 1 |
145 | 2 | 50 | 144 | 2 |
146 | 8 | 25 | 145 | 3 |
147 | 51 | 70 | 144 | 2 |
148 | 57 | 60 | 147 | 3 |
164 | 200 | 250 | 0 | 1 |
172 | 201 | 225 | 164 | 2 |
174 | 201 | 213 | 172 | 3 |
188 | 310 | 350 | 0 | 1 |
194 | 333 | 333 | 188 | 2 |
Script
Use below script to create table and insert sample data into it.
-- CREATE TABLE Testlevels ( id INT ,start_value INT ,end_vaule INT ,[range] INT ,[level] INT ) GO INSERT INTO Testlevels VALUES (144, 1 , 100 , NULL , NULL ), (145, 2 , 50 , NULL , NULL ), (146, 8 , 25 , NULL , NULL ), (147, 51 , 70 , NULL , NULL ), (148, 57 , 60 , NULL , NULL ), (164, 200 , 250 , NULL , NULL ), (172, 201 , 225 , NULL , NULL ), (174, 201 , 213 , NULL , NULL ), (188, 310 , 350 , NULL , NULL ), (192, 325 , 350 , NULL , NULL ), (194, 333 , 333 , NULL , NULL ) GO -- |
Rules/Restrictions
The solution should be should use “SELECT” statement or “CTE”.
Add your solution(s) in the comments section or send you solution(s) to pawankkmr@gmail.com
Solution 1
-- ;WITH CTE AS ( SELECT * FROM Testlevels a EXCEPT SELECT DISTINCT k.* FROM Testlevels a CROSS APPLY ( SELECT * FROM Testlevels b WHERE b.start_value >= a.start_value AND b.start_value <= a.end_vaule AND b.end_vaule >= a.start_value and b.end_vaule <= a.end_vaule AND b.id <> a.id )k ) ,CTE3 AS ( SELECT a.id , a.start_value , a.end_vaule , 0 [range] , 1 [level] FROM CTE a UNION ALL SELECT t.id , t.start_value , t.end_vaule , c.id , c.[level] + 1 [level] FROM CTE3 c INNER JOIN Testlevels t ON ( c.start_value <= t.start_value AND c.end_vaule > t.end_vaule ) ) SELECT id , start_value , end_vaule , [range], [level] FROM ( SELECT * , ROW_NUMBER() OVER (PARTITION BY Id ORDER BY range desc,level desc) rnk FROM CTE3 )X Where rnk = 1 ORDER BY id -- |
Add a comment if you have any other solution in mind. I would love to learn it. We all need to learn.
Enjoy !!! Keep Learning
Pawan Khowal
Http://MSBISkills.com
https://polldaddy.com/js/rating/rating.jsWhy are you excluding ID = 192 from the result set?
The following appears to be producing a correct result set…
WITH
cte_Recursion AS (
SELECT
t1.id,
t1.start_value,
t1.end_vaule,
range = 0,
level = 1
FROM
#Testlevels t1
WHERE
NOT EXISTS (
SELECT 1
FROM
#Testlevels t2
WHERE
t1.id t2.id
AND t1.start_value >= t2.start_value
AND t1.end_vaule <= t2.end_vaule
)
UNION ALL
SELECT
t.id,
t.start_value,
t.end_vaule,
range = r.id,
level = r.level + 1
FROM
#Testlevels t
JOIN cte_Recursion r
ON t.id r.id
AND t.start_value >= r.start_value
AND t.end_vaule <= r.end_vaule
)
SELECT
t.id,
t.start_value,
t.end_vaule,
rl.range,
rl.level
FROM
#Testlevels t
CROSS APPLY (
SELECT TOP 1
r.range,
r.level
FROM
cte_Recursion r
WHERE
t.id = r.id
ORDER BY
r.level DESC,
r.range DESC
) rl;
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