Conversion of SQL to Oracle

Question

SQL Statement
select count(emp_no) "TOTAL",
count(case when TRAISI_NATIONALITY > 1 then emp_no else 0
end) "PR" from staff_view
Oracle Statement:
select count(emp_no) "TOTAL", ?
from staff_view
Please suggest me how to convert the same....
Arun

Answer 1

This should work if all values of traisi_nationality are
positive:
SELECT COUNT(emp_no) "TOTAL",
       SUM(DECODE(NVL(traisi_nationality,1), 1,0, 0,0, 1)) "PR"
FROM staff_view If there may be negative values for traisi_nationality you will
need:
SELECT COUNT(emp_no) "TOTAL",
SUM(DECODE(SIGN(NVL(traisi_nationality,1)), 1,0, 0,0, -
1,0, )) "PR"
FROM staff_view The NVL function will return 1 if traisi_nationality is null,
otherwise it will return traisi_nationality.
The DECODE function takes a value to test (in this case NVL
(traisi_nationality,1)), and a
set of value,result pairs (1,0 and 0,0), and optionally a
default result (here 1). So, if
traisi_nationality is NULL, 0, or 1 then the DECODE function
will return 0, otherwise it will return 1.
The sum of the results of the decode will be equivalent to the
count of traisi_nationality > 1.
The SIGN function returns -1, 0 or 1 depending on whether the
value passed is negative, 0, or positive.