MySQL Limit with Many to Many Relationship

Question

Given a SCHEMA for implementing tags

ITEM ItemId, ItemContent

TAG TagId, TagName

ITEM_TAG ItemId, TagId

What is the best way to limit the number

Answer 1

My second solution uses a MySQL function GROUP_CONCAT() to combine all tags matching the item into a comma-separated string in the result set.

SELECT i.ItemContent, GROUP_CONCAT(t.TagName ORDER BY t.TagName) AS TagList
FROM item AS i 
  INNER JOIN ItemTag AS it ON i.id = it.ItemId 
  INNER JOIN tag AS t ON t.id = it.TagId
GROUP BY i.ItemId;

The GROUP_CONCAT() function is a MySQL feature, it's not part of standard SQL.