In this post, I am sharing an advanced SQL Query question and solution which may ask in the interview of Database Developer.

The question is: Find an available Seats(Status – ‘y’) which are adjacent to each other.
You can achieve this using simple self-join conditions. Check the below solution.

Create a table with sample data:

CREATE TABLE tbl_MoviePlex (Seatid INT, Status CHAR(1))

INSERT INTO tbl_MoviePlex VALUES
(1,'y') 
,(2,'n') 
,(3,'y') 
,(4,'y') 
,(5,'n') 
,(6,'y')

The solution:

SELECT 
	a.Seatid
	,b.Seatid
FROM tbl_MoviePlex a 
INNER JOIN tbl_MoviePlex b 
	on a.Seatid = b.Seatid + 1 
	and a.Status = b.Status

The Result:

Seatid      Seatid
----------- -----------
4           3

(1 row(s) affected)