Question

id  categories  ext_categories
2      36      17,250
8      20      28
10     17      18

if query categories = 17 I can get results like this

id
2  (ext_categories field)
10

How to query ext_categories for id: 2

Thank you!

Answer 1

How is the field ext_categories implemented? For example, are you using a varchar field and pipe-delimited string (of numbers) as values with the strict format

|n|...

so that your table looks like

id  categories  ext_categories
2      36      "|17|250|"
8      20      "|28|"
10     17      "|18|"

instead?

If so, try

select * from table where categories = 17 OR ext_categories like '%|250|%'