Question

How can I select the tag accurately from the tag column with the list of tag?

For instance below is table created using a query, but then I want to narrow down my search,

page_id         tags
1               tile-1,tile-12,tile-10
2               tile-1,tile-10
3               tile-12,tile-10
4               tile-15,tile-16

the result I am after is the pages with tile-1 only,

page_id         tags
1               tile-1,tile-12,tile-10
2               tile-1,tile-10

But the query I am working on below returns all of them, including, tile-12, tile-10, etc.

SELECT*
FROM (...) AS k
WHERE k.tags LIKE '%tile-1%'

May I should not use LIKE?

Answer 1

I suggest to change schema to page_id, tag. so that your data should look like this

1           tile-1
1           tile-12
1           tile-10
2           tile-1
2           tile-10
3           tile-12
3           tile-10
4           tile-15
4           tile-16

Then you can do all this with a simple query,

SELECT * FROM table WHERE tag = 'title-1';

This way you do not have to search through the table (table scans) – which will become an issue once table has more rows (scalable solution).
Second you can use index on the tag column, to make searches super fast.