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Editorial Team
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Asked: 2026-06-10T14:24:40+00:00

It will be better to explain my question on a example. Here is sample

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It will be better to explain my question on a example. Here is sample tables (InnoDB):

— posts

  • id
  • title
  • title_slug
  • content

— tags

  • id
  • name
  • name_slug

— post_tag_relation

  • postID
  • tagID

Let say I am creating simple post system with tag and I insert into post_tag_relation which posts have which tags. postID and tagID are referenced from their table. Here is my question, should I specify id (primary key) in post_tag_relation or is there a better way to create it? What do you suggest to create post_tag_relation table?

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1 Answer

  1. Editorial Team

    You don’t need to specify a seperate ID field for the post_tag_relation table. The combination of postID and tagID should be unique and can form a compound key. The posts and tags tables form a many-to-many relationship and a junction table (like your post_tag_relation table) is used to relate them. If you don’t want to store additional information about the relationship between a tag and a post (e.g. a timestamp indicating when the tag was associated with the post) then the only fields you need in the post_tag_relation table are the foreign keys from the posts and tags tables (ie. postID and tagID).

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