在MySQL中为FIND_IN_SET

Question

select `ID_DOCUMENT` from document WHERE 
find_in_set((SELECT t.id_tag from tags t WHERE t.tag_name="example" LIMIT 1),`TAGS_DOCUMENT`)

tags_document is equal to (1,2,3,4)

The problem is that this query is throwing me result 0.

Answer 1

 SELECT `id_document` 
   FROM document d
   JOIN tags t
     ON FIND_IN_SET(t.id_tag,d.tags_document)
  WHERE t.tag_name = "example" ;

but please consider normalizing your data