MYSQL searching for ID in array from DB

Question

I have done searching, but everything I have found is reverse the way I need.

I have a database where one of the fields is a string of IDs, I want to search for a certain ID in that array I have in the DB already.

For instance, in the database it looks like this:

ID    Title    Spots Used
 1    test 1    1,3,5,8
 2    test 2    4,2,5,6,7
 3    test 3    3,5,2,1

I need to search for how many campaigns were used that have the spot that has the ID of 2 (should return both test 2 and test 3).

What would be the best way to go about this? So far, I can query the entire thing, run row by row, and do a strpos search for the number, but the problem is that when I end up getting more than 10 spots uploaded, 1 will return 1, 10, 11, 12, 13, etc.

If I need to provide more info, please let me know.

Answer 1

If these ids are stored as comma seperated then you can use FIND_IN_SET()

SELECT * FROM `table` WHERE FIND_IN_SET('2',`column_name`) >0

But storing comma separated values is bad idea if you are able to change your schema then first normalize your table structure

Database Normalization

Answer 2

You can have everything in just one table but c'mon what is it good for a relational database,

create two more tables , one will be Spot(id,spot_number) an the other one Campaigns_spot(id_campaign,id_spot), and the let the sql engine do it with a query , this way is far more efficient and you are going to be using a proper database relation.

the query then would be

select count(*) from campaign_spot where id_spot= X (whatever number you want).