Oracle PL/SQL Tutorial/Object Oriented/Update

ORA-22908: reference to NULL table value

SQL>
SQL>
SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) );
Table created.
SQL>
SQL> INSERT INTO DEPT VALUES (10, "ACCOUNTING", "NEW YORK");
1 row created.
SQL> INSERT INTO DEPT VALUES (20, "RESEARCH", "DALLAS");
1 row created.
SQL> INSERT INTO DEPT VALUES (30, "SALES", "CHICAGO");
1 row created.
SQL> INSERT INTO DEPT VALUES (40, "OPERATIONS", "BOSTON");
1 row created.
SQL>
SQL>
SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
  2                    ENAME VARCHAR2(10),
  3                    JOB VARCHAR2(9),
  4                    MGR NUMBER(4),
  5                    HIREDATE DATE,
  6                    SAL NUMBER(7, 2),
  7                    COMM NUMBER(7, 2),
  8                    DEPTNO NUMBER(2));
Table created.
SQL>
SQL> INSERT INTO EMP VALUES (7369, "SMITH", "CLERK",    7902, TO_DATE("17-DEC-1980", "DD-MON-YYYY"), 800, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7499, "ALLEN", "SALESMAN", 7698, TO_DATE("20-FEB-1981", "DD-MON-YYYY"), 1600, 300, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7521, "WARD",  "SALESMAN", 7698, TO_DATE("22-FEB-1981", "DD-MON-YYYY"), 1250, 500, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7566, "JONES", "MANAGER",  7839, TO_DATE("2-APR-1981",  "DD-MON-YYYY"), 2975, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7654, "MARTIN", "SALESMAN", 7698,TO_DATE("28-SEP-1981", "DD-MON-YYYY"), 1250, 1400, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7698, "BLAKE", "MANAGER", 7839,TO_DATE("1-MAY-1981", "DD-MON-YYYY"), 2850, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7782, "CLARK", "MANAGER", 7839,TO_DATE("9-JUN-1981", "DD-MON-YYYY"), 2450, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7788, "SCOTT", "ANALYST", 7566,TO_DATE("09-DEC-1982", "DD-MON-YYYY"), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7839, "KING", "PRESIDENT", NULL,TO_DATE("17-NOV-1981", "DD-MON-YYYY"), 5000, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7844, "TURNER", "SALESMAN", 7698,TO_DATE("8-SEP-1981", "DD-MON-YYYY"), 1500, 0, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7876, "ADAMS", "CLERK", 7788,TO_DATE("12-JAN-1983", "DD-MON-YYYY"), 1100, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7900, "JAMES", "CLERK", 7698,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 950, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7902, "FORD", "ANALYST", 7566,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7934, "MILLER", "CLERK", 7782,TO_DATE("23-JAN-1982", "DD-MON-YYYY"), 1300, NULL, 10);
1 row created.
SQL>
SQL> create or replace type emp_type
  2    as object
  3    (empno       number(4),
  4     ename       varchar2(10),
  5     job         varchar2(9),
  6     mgr         number(4),
  7     hiredate    date,
  8     sal         number(7, 2),
  9     comm        number(7, 2)
 10    );
 11  /
Type created.
SQL>
SQL> create or replace type emp_tab_type
  2    as table of emp_type
  3  /
Type created.
SQL> create table dept_and_emp
  2    (deptno number(2) primary key,
  3     dname     varchar2(14),
  4     loc       varchar2(13),
  5     emps      emp_tab_type
  6    )
  7    nested table emps store as emps_nt;
Table created.
SQL>
SQL> alter table emps_nt add constraint emps_empno_unique unique(empno)
  2  /
Table altered.

SQL>
SQL> insert into dept_and_emp
  2    select dept.*,
  3       CAST( multiset( select empno, ename, job, mgr, hiredate, sal, comm from emp
  4                         where emp.deptno = dept.deptno ) AS emp_tab_type )
  5      from dept
  6  /
4 rows created.
SQL>
SQL>
SQL>
SQL>
SQL> update table( select emps from dept_and_emp where deptno = 1) set comm = 100
  2  /
update table( select emps from dept_and_emp where deptno = 1) set comm = 100
*
ERROR at line 1:
ORA-22908: reference to NULL table value

SQL>
SQL>
SQL> drop table dept cascade constraint;
Table dropped.
SQL> drop table emp;
Table dropped.
SQL> drop table dept_and_emp;
Table dropped.
SQL> drop type emp_tab_type;
Type dropped.
SQL> drop type emp_type;
Type dropped.

Update user-defined type column

SQL>
SQL>
SQL> create table emp
  2  ( empno      NUMBER(4)    constraint E_PK primary key
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , sal        NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2)    default 10
 11  ) ;
Table created.
SQL> insert into emp values(1,"Tom","N",   "TRAINER", 13,date "1965-12-17",  800 , NULL,  20);
1 row created.
SQL> insert into emp values(2,"Jack","JAM", "Tester",6,date "1961-02-20",  1600, 300,   30);
1 row created.
SQL> insert into emp values(3,"Wil","TF" ,  "Tester",6,date "1962-02-22",  1250, 500,   30);
1 row created.
SQL> insert into emp values(4,"Jane","JM",  "Designer", 9,date "1967-04-02",  2975, NULL,  20);
1 row created.
SQL> insert into emp values(5,"Mary","P",  "Tester",6,date "1956-09-28",  1250, 1400,  30);
1 row created.
SQL> insert into emp values(6,"Black","R",   "Designer", 9,date "1963-11-01",  2850, NULL,  30);
1 row created.
SQL> insert into emp values(7,"Chris","AB",  "Designer", 9,date "1965-06-09",  2450, NULL,  10);
1 row created.
SQL> insert into emp values(8,"Smart","SCJ", "TRAINER", 4,date "1959-11-26",  3000, NULL,  20);
1 row created.
SQL> insert into emp values(9,"Peter","CC",   "Designer",NULL,date "1952-11-17",  5000, NULL,  10);
1 row created.
SQL> insert into emp values(10,"Take","JJ", "Tester",6,date "1968-09-28",  1500, 0,     30);
1 row created.
SQL> insert into emp values(11,"Ana","AA",  "TRAINER", 8,date "1966-12-30",  1100, NULL,  20);
1 row created.
SQL> insert into emp values(12,"Jane","R",   "Manager",   6,date "1969-12-03",  800 , NULL,  30);
1 row created.
SQL> insert into emp values(13,"Fake","MG",   "TRAINER", 4,date "1959-02-13",  3000, NULL,  20);
1 row created.
SQL> insert into emp values(14,"Mike","TJA","Manager",   7,date "1962-01-23",  1300, NULL,  10);
1 row created.
SQL>
SQL>
SQL>
SQL> create table e
  2  as
  3  select empno, ename, init, mgr, deptno
  4  from   emp;
Table created.
SQL>
SQL>
SQL> create or replace type numberlist_t
  2  as varray(4) of varchar2(20);
  3  /
Type created.
SQL>
SQL> column numlist format a60
SQL>
SQL> alter table e add (numlist numberlist_t);
Table altered.
SQL>
SQL> describe e
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 EMPNO                                              NUMBER(4)
 ENAME                                              VARCHAR2(8)
 INIT                                               VARCHAR2(5)
 MGR                                                NUMBER(4)
 DEPTNO                                             NUMBER(2)
 NUMLIST                                            NUMBERLIST_T
SQL>
SQL> update e
  2  set    numlist = numberlist_t("1234","06-78532","029-8532")
  3  where  empno = 9;
1 row updated.
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> drop table e;
Table dropped.
SQL> drop table emp;
Table dropped.
SQL>

Updating a Row in the Table with object type column

SQL>
SQL> CREATE Or Replace TYPE ProductType AS OBJECT (
  2    id          NUMBER,
  3    name        VARCHAR2(15),
  4    description VARCHAR2(22),
  5    price       NUMBER(5, 2),
  6    days_valid  NUMBER
  7  )
  8  /
Type created.
SQL> CREATE TABLE products (
  2    product           ProductType,
  3    count             NUMBER
  4  )
  5  /
Table created.
SQL>
SQL> INSERT INTO products (product,count) VALUES (
  2            ProductType(1, "AA", "BBB", 3.95, 10),50
  3  );
1 row created.
SQL>
SQL> INSERT INTO products (product,count) VALUES (
  2            ProductType(2, "CC", "DDDD", 2.99, 5),25
  3  );
1 row created.
SQL>
SQL> SELECT product
  2  FROM products;
PRODUCT(ID, NAME, DESCRIPTION, PRICE, DAYS_VALID)
------------------------------------------------------
PRODUCTTYPE(1, "AA", "BBB", 3.95, 10)
PRODUCTTYPE(2, "CC", "DDDD", 2.99, 5)
SQL>
SQL>
SQL> UPDATE products p
  2  SET p.product.description = "new D"
  3  WHERE p.product.id = 1;
1 row updated.
SQL>
SQL> SELECT product
  2  FROM products;
PRODUCT(ID, NAME, DESCRIPTION, PRICE, DAYS_VALID)
--------------------------------------------------------
PRODUCTTYPE(1, "AA", "new D", 3.95, 10)
PRODUCTTYPE(2, "CC", "DDDD", 2.99, 5)
SQL>
SQL>
SQL> drop table products;
Table dropped.
SQL>