Question

After following this recommendation regarding tags tables structure, I’ve implemented the following design:

Table: Item Columns: ItemID, Title, Content  Table: Tag Columns: TagID, Title  Table: ItemTag Columns: ItemID, TagID 

I’m facing another problem, I wanna display the number each tag appears in the system. What’s the best way to do this in terms of search query / php code that will not cause a severe performance impact (tags count will appear for each item).

Thanks,

Roy

Answer 1

select count(*) from ItemTag where TagId = X 

is mySQL that will get it dynamically.

If you’re worried about the performance hit, you should store a count in the tag table, and increment/decrement it when you tag or untag an item.