Pierre-Frédéric Caillaud wrote:
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 ?
Just One, user can i have only one bankaccount.
select userID
from bankaccount
WHERE accountnumber = '12345678'
select userID
from bankaccount
WHERE routingNumber = '12345678'
Can you post EXPLAIN ANALYZE for these two queries ?
Regards.
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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