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SQL PUZZLE | The IN-NOTIN & UNION Puzzle | SQL Interview Question
Well It is one of the most interesting interview questions I have. Find all the rows where ID IS not in (‘Id9’, ‘Id10’, ‘Id11’) and If the ID is in (‘Id9’, ‘Id10’, ‘Id11’) with num columns value is greater than 0 the we also need to include that rows. One restriction is that we cannot use the UNION or UNION ALL in this question. 🙂 . You also need to find out rows where .For more details please see the sample input and expected output.
Sample Input
| Num | Vals | Id | Description |
|---|---|---|---|
| 5 | 2 | Id6 | T1 |
| 5 | 2 | Id7 | T2 |
| 5 | 2 | Id8 | T3 |
| 1 | 2 | Id9 | T4 |
| 0 | 2 | Id10 | T5 |
| 0 | 2 | Id11 | T6 |
Expected Output
| Num | Vals | Id | Description |
|---|---|---|---|
| 5 | 2 | Id6 | T1 |
| 5 | 2 | Id7 | T2 |
| 5 | 2 | Id8 | T3 |
| 1 | 2 | Id9 | T4 |
Script – DDL and INSERT Sample Data
-- CREATE TABLE TheNOTIn ( Num INT ,Vals INT ,Id VARCHAR(10) ,[Description] VARCHAR(5) ) GO INSERT INTO TheNOTIn VALUES (5,2,'Id6','T1'), (5,2,'Id7','T2'), (5,2,'Id8','T3'), (1,2,'Id9','T4'), (0,2,'Id10','T5'), (0,2,'Id11','T6') GO SELECT * FROM TheNOTIn GO -- |
SOLUTION – 1
--
SELECT *
FROM TheNOTIn
WHERE
1 = CASE WHEN ID NOT IN ('Id9', 'Id10', 'Id11') THEN 1
WHEN ID IN ('Id9', 'Id10', 'Id11') AND Num > 0 THEN 1
ELSE 2
END
--
|
Output – 1
-- Num Vals Id Description ----------- ----------- ---------- ----------- 5 2 Id6 T1 5 2 Id7 T2 5 2 Id8 T3 1 2 Id9 T4 (4 rows affected) -- |
SOLUTION – 2 | With UNION, IN AND NOT IN
--
SELECT *
FROM TheNOTIn
WHERE ID NOT IN ('Id9', 'Id10', 'Id11')
UNION
SELECT *
FROM TheNOTIn
WHERE ID IN ('Id9', 'Id10', 'Id11') and Num > 0
--
|
Output – 2
-- Num Vals Id Description ----------- ----------- ---------- ----------- 1 2 Id9 T4 5 2 Id6 T1 5 2 Id7 T2 5 2 Id8 T3 (4 rows affected) -- |
SOLUTION – 3 | IIF
--
SELECT *
FROM TheNOTIn
WHERE
1 = IIF(ID NOT IN ('Id9', 'Id10', 'Id11'),1,IIF(
ID IN ('Id9', 'Id10', 'Id11') AND Num > 0,1,2))
--
|
Output – 3
-- Num Vals Id Description ----------- ----------- ---------- ----------- 5 2 Id6 T1 5 2 Id7 T2 5 2 Id8 T3 1 2 Id9 T4 (4 rows affected) -- |
Enjoy 🙂
Please add comment(s) if you have one or multiple solutions in mind. Thank You.
Pawan Khowal
Pawan is a SQL Server Developer. If you need any help in writing code/puzzle or training please email at – pawankkmr”AT”gmail.com. Meanwhile please go throgh the top pages from his blog.
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