Leetcode: Consecutive Available Seats

Consecutive Available Seats

Similar Problems:

• CheatSheet: SQL & MySql
• CheatSheet: Leetcode For Code Interview
• Tag: #sql

Several friends at a cinema ticket office would like to reserve consecutive available seats.
Can you help to query all the consecutive available seats order by the seat_id using the following cinema table?

| seat_id | free |
|---------|------|
| 1       | 1    |
| 2       | 0    |
| 3       | 1    |
| 4       | 1    |
| 5       | 1    |

Your query should return the following result for the sample case above.

| seat_id |
|---------|
| 3       |
| 4       |
| 5       |

Note:

• The seat_id is an auto increment int, and free is bool (‘1’ means free, and ‘0’ means occupied.).
• Consecutive available seats are more than 2(inclusive) seats consecutively available.

Github: code.dennyzhang.com

Credits To: leetcode.com

Leave me comments, if you have better ways to solve.

## Blog link: https://code.dennyzhang.com/consecutive-available-seats
select distinct t1.seat_id
from cinema as t1 join cinema as t2
on abs(t1.seat_id-t2.seat_id)=1
where t1.free='1' and t2.free='1'
order by t1.seat_id