Decode question

[que_card]

create table emp ( ename varchar2(20),
empno varchar2(10),
job varchar2(20),
hiredate date,
salary number (10,2),
comm number (10,2));

Then insert rows

create view emp_view as (
select ename, empno, job, hiredate,
decode ( ename, user, sal, 'KING',sal, 0) as sal,
decode ( ename, user, comm, 'KING', sal, 0) as comm
from emp);

I understand the basic decode( ename, 'kevin', MANAGER)
as if ename equal kevin then replace with MANAGER, but I don't understand decode( ename, user, sal, 'KING',sal, 0) as sal,

Please explain... thank you

[Shestakov]

1)
decode ( ename,
user, sal,
'KING',sal,
0) as sal,
--------------------------------------------------------
2)
decode ( ename,
user, comm,
'KING', sal,
0) as comm
--------------------------------------------------------
1) explain:
if field ENAME = user (User fo current session > LOGON) then
return value from field SAL
else
if field ENAME = 'KING' (as constant) then return value from field SAL
for any others value from field ENAME return 0.

2)
if field ENAME = user (User fo current session > LOGON) then
return value from field COMM (probably commitions)
else
if field ENAME = 'KING' (as constant) then return value from field SAL
for any others value from field ENAME return 0.
----------------------------------------------------------------
Note: USER is standart function, that return name of current user(session)

[que_card]

Thanks for the quick reply, that makes sense.