Associative arrays (index-by tables) : Associative Arrays « Collections « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Collections » Associative Arrays 
26. 7. 2. Associative arrays (index-by tables)

An associative array is a collection of elements that use arbitrary numbers and strings for subscript values.

You cannot use an associative array in SQL.

declare
  type AssocArray is table of ElementType index by binary_integer|pls_integer|VARCHAR2(size);
SQL>
SQL>
SQL> -- create demo table
SQL> create table Employee(
  2    ID                 VARCHAR2(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  /

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  /

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  /

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  /

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  /

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  /

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  /

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  /

row created.

SQL>
SQL>
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

rows selected.

SQL>
SQL>
SQL>
SQL> declare
  2      type dept_rty is record(id varchar(20), extra_tx VARCHAR2(2000));
  3      type dept_aa is table of dept_rty index by binary_integer;
  4
  5      v_dept_aa dept_aa;
  6
  7      cursor c_emp is select first_Name, id from employee;
  8  begin
  9    v_dept_aa(10).id := '01';
 10    v_dept_aa(20).id := '02';
 11    v_dept_aa(30).id := '03';
 12
 13    for r_emp in c_emp loop
 14         v_dept_aa(r_emp.id).extra_tx:= v_dept_aa(r_emp.id).extra_tx|| ' '||r_emp.first_Name;
 15    end loop;
 16  end;
 17  /
declare
*
ERROR at line 1:
ORA-01403: no data found
ORA-06512: at line 14


SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /

Table dropped.

SQL>
SQL>
26. 7. Associative Arrays
26. 7. 1. Associative Arrays demo
26. 7. 2. Associative arrays (index-by tables)
26. 7. 3. PL/SQL Table
26. 7. 4. Index by string
26. 7. 5. Nested Table with Table row elements inside
26. 7. 6. Assign value to PL/SQL table
26. 7. 7. TABLE.Exist
26. 7. 8. Clear the salaries table by assigning the empty version to it
26. 7. 9. Place some values into the salaries table
26. 7. 10. PL/SQL table of cursor
26. 7. 11. Select data into PL/SQL table of cursor
26. 7. 12. Use For loop to output data in a PL/SQL table of cursor
26. 7. 13. Use for all loop to loop through the PL/SQL table
26. 7. 14. Change PL/SQL table element by index
26. 7. 15. Insert data in PL/SQL table to a real table
26. 7. 16. The COUNT Table Attribute
26. 7. 17. Uses the COUNT method to display the number of rows contained in an index-by table
26. 7. 18. The DELETE Table Attribute
26. 7. 19. The EXISTS Table Attribute
26. 7. 20. FIRST and LAST Table Attributes
26. 7. 21. NEXT and PRIOR Table Attributes
26. 7. 22. Using INDEX BY BINARY_INTEGER
26. 7. 23. Indexing Associative Arrays
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