help me please

Hello, help me please,
I don't know how, but i got 2 postgres users.
How can I delete the first one ????
thx alot for your answers.
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
select passwd,ctid,xmin,xmax,cmin,cmax from pg_shadow where usesysid =1;
passwd | ctid | xmin | xmax |
cmin | cmax
-------------------------------------+-------+------+----------+----------+-----
-
| (0,1) | 1 | 16754522 |
16754522 | 0
md510db8c04d26d32185270721fcf32155 | (0,2) | 2 | 0 | 0
| 0
(2 rows)
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
select * from pg_shadow where usesysid=1;
usename | usesysid | usecreatedb | usesuper | usecatupd
|
passwd
| valuntil | useconfig
----------+----------+-------------+----------+-----------+---------------------
----------------+----------+-----------
postgres | 1 | t | t | t
|
| |
postgres | 1 | t | t | t |
md510db8c04d231142d5
270721fcf740ed5 | infinity |
(2 rows)
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Tom Lane пишет:
> "spol(at)mail(dot)ru" <spol(at)mail(dot)ru> writes:
>
>> I have two "postgres" user. How to delete the first one ???
>>
>
> Let's see the system columns (ctid,xmin,xmax,cmin,cmax) for those
> two rows?
>
> regards, tom lane
>
>
>