Select rows which are not present in other table

Question

I\'ve got two postgresql tables:

table name     column names
-----------    ------------------------
login_log             


        

Answer 1

this can also be tried...

SELECT l.ip, tbl2.ip as ip2, tbl2.hostname
FROM   login_log l 
LEFT   JOIN (SELECT ip_location.ip, ip_location.hostname
             FROM ip_location
             WHERE ip_location.ip is null)tbl2