Just wanted to know the selectivity of the accountnumber and routingNumber columns.
I shoulda written :

How many rows do the following queries return :
One or few at most, or a lot ?

select userID from bankaccount WHERE accountnumber = '12345678'

select userID
          from bankaccount
          WHERE routingNumber = '12345678'

    Can you post EXPLAIN ANALYZE for these two queries ?

Thanks! for the quick reply. It should usually return just one account for that user so its only one record. Actually userid column doesnt exist on bankaccount table it exists only on the user table and it is joined with bankaccountid column, if i run this query separately i wouldnt able to run it .

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