Question

I am using a PostgreSQL database. I have one select query:

select userid, name, age from tbluser;

Now there is another table, tblcalculatedtax, which is generated on the fly and their column names are not predefined, the only mapping between that table and this table is userid. I want to get records after joining two tables. How can I get that?

Answer 1

Simpler:

SELECT *
FROM   tbluser 
JOIN   tblcalculatedtax USING (userid)

Details in the fine manual about SELECT.