Will the Where condition be better than the JOIN table condition?

Dear experts,

I've question with mysql query.  I want to process an online order which users will input the item number and the quantity that they wish to buy.

Will it be better that I store the item number and quantity into a temporary table and do a JOIN with the item number (item numbers are unique number) in my item table or I can select the columns that I need from item table and place all the item numbers provided by users in the where condition of a query?

User's input can be ranged from a single row to few thousand rows(maybe 10K on rare occasions).

Thanks
Kinderly WadeprogrammerAsked:
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nemws1Database AdministratorCommented:
Well, for small sets I'd do an inline WHERE, but for large sets, I'd do the temp table.  The safe bet is the temp table.  If you have a *really* huge set of numbers, you might run into the 'max_packet_size' for MySQL when trying to do a WHERE and then it won't work at all (although this would be pretty dang rare and they'd have to have a ton of rows selected).
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