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SQL Puzzle | The User Access Control Puzzle
Well I must say this is a very very good puzzle. This puzzle was asked to me by my friend & colleague Deepak. He came to this scenario while working on a task. In this puzzle there are only 6 columns. Its basically a tree structure. column a is a parent. Column b is children of column a and so on. Now if column b has all value 0 then for column a the output will be distinct values from column a and 0 for column b. If you have non zero value in column b for a row then for column b that non zero column value will come and in column a 0 will come. For details check sample input and expected output.
Use below script to create table and insert sample data into it.
-- CREATE TABLE DeepakPuzzle ( a INT ,b INT ,c INT ,d INT ,e INT ,f INT ) GO INSERT INTO DeepakPuzzle VALUES (5,5,1,0,0,0), (5,5,2,3,0,0), (5,4,3,4,0,0), (5,4,3,5,1,0), (5,4,4,6,2,0) GO GO --
The solution should be should use “SELECT” statement or “CTE”.
Add your solution(s) in the comments section or send you solution(s) to firstname.lastname@example.org
SOLUTION 1 | Using Cross APPLY
-- No solution 🙂 --
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