Create a procedure to count employees : Utility Function « Function Procedure Packages « Oracle PL/SQL Tutorial






SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;

Table created.

SQL>
SQL>
SQL> insert into employees values(1,'Jason',  'N',  'TRAINER', 2,   date '1965-12-18',  800 , NULL,  10);

1 row created.

SQL> insert into employees values(2,'Jerry',  'J',  'SALESREP',3,   date '1966-11-19',  1600, 300,   10);

1 row created.

SQL> insert into employees values(3,'Jord',   'T' , 'SALESREP',4,   date '1967-10-21',  1700, 500,   20);

1 row created.

SQL> insert into employees values(4,'Mary',   'J',  'MANAGER', 5,   date '1968-09-22',  1800, NULL,  20);

1 row created.

SQL> insert into employees values(5,'Joe',    'P',  'SALESREP',6,   date '1969-08-23',  1900, 1400,  30);

1 row created.

SQL> insert into employees values(6,'Black',  'R',  'MANAGER', 7,   date '1970-07-24',  2000, NULL,  30);

1 row created.

SQL> insert into employees values(7,'Red',    'A',  'MANAGER', 8,   date '1971-06-25',  2100, NULL,  40);

1 row created.

SQL> insert into employees values(8,'White',  'S',  'TRAINER', 9,   date '1972-05-26',  2200, NULL,  40);

1 row created.

SQL> insert into employees values(9,'Yellow', 'C',  'DIRECTOR',10,  date '1973-04-27',  2300, NULL,  20);

1 row created.

SQL> insert into employees values(10,'Pink',  'J',  'SALESREP',null,date '1974-03-28',  2400, 0,     30);

1 row created.

SQL>
SQL>
SQL>
SQL> create or replace function emp_count(p_deptno in number)
  2  return number is
  3         cnt number(2) := 0;
  4  begin
  5         select count(*)  into cnt
  6         from   employees e
  7         where  e.deptno = p_deptno;
  8         return (cnt);
  9  end;
 10  /

Function created.

SQL>
SQL>
SQL> select empno, ename
  2  ,      emp_count(empno)
  3  from   employees;

     EMPNO ENAME    EMP_COUNT(EMPNO)
---------- -------- ----------------
         1 Jason                   0
         2 Jerry                   0
         3 Jord                    0
         4 Mary                    0
         5 Joe                     0
         6 Black                   0
         7 Red                     0
         8 White                   0
         9 Yellow                  0
        10 Pink                    2

10 rows selected.

SQL>
SQL> drop table employees;

Table dropped.

SQL>
SQL>








27.26.Utility Function
27.26.1.Get nearest day
27.26.2.Compare date offset in a function
27.26.3.Create a procedure to count employees
27.26.4.To number or null
27.26.5.Removes all numeric digits from the string passed in.
27.26.6.Generic function utilizing dynamic SQL to return the number of rows in the specified table.
27.26.7.Get the Max date
27.26.8.String between function
27.26.9.Add day to month
27.26.10.Date time calculation function
27.26.11.Table Count function
27.26.12.Word count function
27.26.13.Define your own varchar to date function
27.26.14.Get the next business day
27.26.15.Format money
27.26.16.Date calculation: business days between
27.26.17.Convert Comma-separated values to table collection
27.26.18.Function to convert celsius to fahrenheit
27.26.19.Function to convert fahrenheit to celsius
27.26.20.Get circle area