Collections Oracle PLSQL Tutorial

Generate a list of employees grouped by two parameters

SQL> -- create demo table
SQL> create table Employee(
  2    ID                 VARCHAR2(4 BYTE)         NOT NULL,
  3    First_Name         VARCHAR2(10 BYTE),
  4    Last_Name          VARCHAR2(10 BYTE),
  5    Start_Date         DATE,
  6    End_Date           DATE,
  7    Salary             Number(8,2),
  8    City               VARCHAR2(10 BYTE),
  9    Description        VARCHAR2(15 BYTE)
 10  )
 11  /
Table created.
SQL>
SQL> -- prepare data
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2               values ('01','Jason',    'Martin',  to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56, 'Toronto',  'Programmer')
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('02','Alison',   'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78, 'Vancouver','Tester')
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('03','James',    'Smith',   to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 6544.78, 'Vancouver','Tester')
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('04','Celia',    'Rice',    to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 2344.78, 'Vancouver','Manager')
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('05','Robert',   'Black',   to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 2334.78, 'Vancouver','Tester')
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('06','Linda',    'Green',   to_date('19870730','YYYYMMDD'), to_date('19960104','YYYYMMDD'), 4322.78,'New York',  'Tester')
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('07','David',    'Larry',   to_date('19901231','YYYYMMDD'), to_date('19980212','YYYYMMDD'), 7897.78,'New York',  'Manager')
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('08','James',    'Cat',     to_date('19960917','YYYYMMDD'), to_date('20020415','YYYYMMDD'), 1232.78,'Vancouver', 'Tester')
  3  /
1 row created.
SQL>
SQL> -- display data in the table
SQL> select * from Employee
  2  /
ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- -------------------- -------------------- --------- --------- ---------- ---------- ---------------
01   Jason                Martin               25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison               Mathews              21-MAR-76 21-FEB-86    6661.78 Vancouver  Tester
03   James                Smith                12-DEC-78 15-MAR-90    6544.78 Vancouver  Tester
04   Celia                Rice                 24-OCT-82 21-APR-99    2344.78 Vancouver  Manager
05   Robert               Black                15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
06   Linda                Green                30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David                Larry                31-DEC-90 12-FEB-98    7897.78 New York   Manager
08   James                Cat                  17-SEP-96 15-APR-02    1232.78 Vancouver  Tester
8 rows selected.
SQL>
SQL> declare
  2      type list_aa is table of VARCHAR2(2000) index by VARCHAR2(256);
  3      v_list_aa list_aa;
  4
  5      cursor c_dept is select id from employee;
  6      cursor c_emp is select first_name, id,to_char(start_Date,'q') q_nr from employee;
  7      v_subscript_tx VARCHAR2(256);
  8  begin
  9    for r_dept in c_dept loop
 10         v_list_aa(r_dept.id||'|1'):='Q1 Dept#' ||r_dept.id||':';
 11         v_list_aa(r_dept.id||'|2'):='Q2 Dept#' ||r_dept.id||':';
 12         v_list_aa(r_dept.id||'|3'):='Q3 Dept#' ||r_dept.id||':';
 13         v_list_aa(r_dept.id||'|4'):='Q4 Dept#' ||r_dept.id||':';
 14    end loop;
 15
 16   for r_emp in c_emp loop
 17     v_list_aa(r_emp.id||'|'||r_emp.q_nr):= v_list_aa(r_emp.id||'|'||r_emp.q_nr)|| ' '||r_emp.first_Name;
 18   end loop;
 19
 20   v_subscript_tx:=v_list_aa.first;
 21   loop
 22      DBMS_OUTPUT.put_line(v_list_aa(v_subscript_tx));
 23      v_subscript_tx:=v_list_aa.next(v_subscript_tx);
 24      exit when v_subscript_tx is null;
 25   end loop;
 26  end;
 27  /
Q1 Dept#01:
Q2 Dept#01:
Q3 Dept#01: Jason
Q4 Dept#01:
Q1 Dept#02: Alison
Q2 Dept#02:
Q3 Dept#02:
Q4 Dept#02:
Q1 Dept#03:
Q2 Dept#03:
Q3 Dept#03:
Q4 Dept#03: James
Q1 Dept#04:
Q2 Dept#04:
Q3 Dept#04:
Q4 Dept#04: Celia
Q1 Dept#05: Robert
Q2 Dept#05:
Q3 Dept#05:
Q4 Dept#05:
Q1 Dept#06:
Q2 Dept#06:
Q3 Dept#06: Linda
Q4 Dept#06:
Q1 Dept#07:
Q2 Dept#07:
Q3 Dept#07:
Q4 Dept#07: David
Q1 Dept#08:
Q2 Dept#08:
Q3 Dept#08: James
Q4 Dept#08:
PL/SQL procedure successfully completed.
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /
Table dropped.
SQL>