vb.org Archive - View Single Post - Questions about indexing custom tables in db

Thanks for tips paul, so generally speaking anytime columns are listed in db queries (big ones), they should be indexed?

For instance...
I attached a screenshot of explain view for the big query and I notice in the "extra" column sometimes it says one (or more) of the following:
using where
using temporary
using filesort
using index

What exactly does this tell me? Does it tell me that I need to index the tables which are not "using index" ?

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