How do i write PHP/MYSQL Code to search on the first value of a database field that is stored as a csv list?

I have a table - Product.





Product.Keywords is a csv list of entries. I want to be able to pull out all of the Product records whose first entry in that field matches the first entry in the field of the Product record I currently have available.





IE keyword of my product is (say) "fish, chips, peas". I want all the products whose first keyword is "fish" but excluding my original product.

How do i write PHP/MYSQL Code to search on the first value of a database field that is stored as a csv list?
LIKE 'fish%'

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