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SQL Puzzle | The nearest date puzzle
In this puzzle you have two table – T2 & T1. Based on the dates from T1 table we need to pick the nearest date from table T2 which is greater then the t1 date.
Please check out the sample input values and sample expected output below.
Sample Input
T1
| Id | Dates |
|---|---|
| 1 | 2017-01-01 14:11:22.990 |
| 2 | 2017-01-05 14:11:22.990 |
| 3 | 2017-01-10 14:11:22.990 |
T2
| Id | Dates |
|---|---|
| 1 | 2017-01-01 14:11:22.990 |
| 2 | 2017-01-06 14:11:22.990 |
| 3 | 2017-01-07 14:11:22.990 |
| 4 | 2017-01-08 14:11:22.990 |
| 5 | 2017-01-09 14:11:22.990 |
| 6 | 2017-01-10 14:11:22.990 |
| 7 | 2017-01-11 14:11:22.990 |
| 8 | 2017-01-12 14:11:22.990 |
| 9 | 2017-01-13 14:11:22.990 |
| 10 | 2017-01-14 14:11:22.990 |
Expected Output
| T1Id | T1Date | T2Id | T2Date |
|---|---|---|---|
| 1 | 2017-01-01 14:11:22.990 | 2 | 2017-01-06 14:11:22.990 |
| 2 | 2017-01-05 14:11:22.990 | 2 | 2017-01-06 14:11:22.990 |
| 3 | 2017-01-10 14:11:22.990 | 7 | 2017-01-11 14:11:22.990 |
Script
Use below script to create table and insert sample data into it.
--
CREATE TABLE T1
(
Id INT
,Dates DATETIME
)
GO
INSERT INTO T1 VALUES
(1,'2017-01-01 14:11:22.990'),
(2,'2017-01-05 14:11:22.990'),
(3,'2017-01-10 14:11:22.990')
GO
CREATE TABLE T2
(
Id INT
,Dates DATETIME
)
GO
INSERT INTO T2 VALUES
(1,'2017-01-01 14:11:22.990'),
(2,'2017-01-06 14:11:22.990'),
(3,'2017-01-07 14:11:22.990'),
(4,'2017-01-08 14:11:22.990'),
(5,'2017-01-09 14:11:22.990'),
(6,'2017-01-10 14:11:22.990'),
(7,'2017-01-11 14:11:22.990'),
(8,'2017-01-12 14:11:22.990'),
(9,'2017-01-13 14:11:22.990'),
(10,'2017-01-14 14:11:22.990')
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
-- SELECT a.Id T1Id,a.Dates T1Date,k.Id T2Id ,k.Dates T2Date FROM T1 a OUTER APPLY ( SELECT TOP 1 * FROM T2 b WHERE a.Dates < b.Dates )k -- |
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
Improving my SQL BI Skills 
Select t1.dates
, (Select top 1 t2.dates from t2 where t1.dates < t2.dates )
From t1
LikeLiked by 1 person
You should add an ORDER BY clause to your “Solution 1” solution… Without it, there are no guarantees that you’ll get lowest date out of the available options…
SELECT
t1.Id,
t1.Dates,
t2x.Id,
t2x.Dates
FROM
#T1 t1
CROSS APPLY (
SELECT TOP 1
t2.Id,
t2.Dates
FROM
#T2 t2
WHERE
t1.Dates < t2.Dates
ORDER BY
t2.Dates
) t2x
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