User creation

Hi Experts,

 

I am new to postgresql, just wanted to know more about user creation.

 

I tried to create users using command [create user sam] without any option] what are the default rights given to the user?

radius=> select * from pg_user;
 usename  | usesysid | usecreatedb | usesuper | usecatupd | userepl |  passwd  | valuntil | useconfig
----------+----------+-------------+----------+-----------+---------+----------+----------+-----------
 postgres |       10 | t           | t        | t         | t       | ******** |          |
 radius   |  9479531 | f           | t        | t         | t       | ******** |          |
 sam      |  9492031 | f           | f        | f         | f       | ******** |          |

what doest 't' and 'f' denotes here?? just want to clarify...