how to make query

Hi Team,

we are using Python Django and Postgresql. Our requirement is to search 10
Million Card data and bring specific records as a result after checking the
record every time.

We have to find data from a 2nd table that is related to the first one
which we are checking using the loop.

For Ex:-
10000 data - loop 10000 times
to find data from the 2nd table.

This makes our query too slower and it gets time out.

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Best Regards,
Sachin Kumar