Beware...nasty sql below
select decode((select deptno from dept where upper(loc) = upper('&vloc')),
<-- expression
(select deptno from dept where loc = 'NEW YORK'),
<-- value1
(select count(*) from emp where deptno = 10),
<-- return1
(select deptno from dept where loc = 'DALLAS'),
<-- value2
(select count(*) from emp where deptno = 20),
<-- return2
(select deptno from dept where loc = 'CHICAGO'),
<-- value3
(select count(*) from emp where deptno = 30),
<-- return3
(select count(*) from emp where deptno not in (10,20,30))
<-- default_return
) emp_count
from dual
SQL> /
Enter value for vloc: DALLAS
EMP_COUNT
----------
5
SQL> /
Enter value for vloc: Chicago
EMP_COUNT
----------
6
SQL> /
Enter value for vloc: DENVER
EMP_COUNT
----------
0
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Author: Fink, Dan
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