I've a bunch of IDs fetched(around 60,000) from a DB.
I'm using these IDs to fetch data from another DB
having a related fields in its tables. I'm using IN
clause for it. i.e. for e.g. SELECT * FROM site_users
WHERE parentUserId IN (1,2,3,4....)
Again here parentUserId is Indexed.
The query is running fine for now. I wanted to know
how MySQL interprets and executes this query and can
it have problems in future??
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