Wrap case when into sum() function

    

SQL>
SQL> create table emp(
  2           emp_no                 integer         primary key
  3          ,lastname               varchar2(20)    not null
  4          ,firstname              varchar2(15)    not null
  5          ,midinit                varchar2(1)
  6          ,street                 varchar2(30)
  7          ,city                   varchar2(20)
  8          ,state                  varchar2(2)
  9          ,zip                    varchar2(5)
 10          ,shortZipCode           varchar2(4)
 11          ,area_code              varchar2(3)
 12          ,phone                  varchar2(8)
 13          ,salary                 number(5,2)
 14          ,birthdate              date
 15          ,startDate              date
 16          ,title                  varchar2(20)
 17          ,dept_no                integer
 18          ,mgr                    integer
 19          ,region                 number
 20          ,division               number
 21          ,total_sales            number
 22  );

Table created.

SQL>
SQL> -- emp Table Inserts:
SQL> insert into emp(emp_no, lastname, firstname, midinit, street, city, state, zip,shortZipCode, area_code, phone, birthdate, title)values
  2                      (1,'Z','Joy','R','1 Ave','New York','NY','12122','2333','212','200-1111','12-nov-1976','President');

1 row created.

SQL>
SQL>
SQL> select
  2   sum ( case when salary between 6 and 10 then 1 else 0 end )
  3        as sal_6_10,
  4   sum ( case when salary between 11 and 15 then 1 else 0 end )
  5        as sal_11_15,
  6   sum ( case when salary between 16 and 20 then 1 else 0 end )
  7        as sal_16_20,
  8   sum ( case when salary between 21 and 25 then 1 else 0 end )
  9        as sal_21_25
 10  from emp;

  SAL_6_10  SAL_11_15  SAL_16_20  SAL_21_25
---------- ---------- ---------- ----------
         0          0          0          0

1 row selected.

SQL> drop table emp;

Table dropped.

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Wrap case when into sum() function : SUM « Aggregate Functions « Oracle PL / SQL

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