Change null status of an existing column : NOT NULL « Table « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Table » NOT NULL 
6. 11. 4. Change null status of an existing column
SQL>
SQL> CREATE TABLE product (
  2       product_name     VARCHAR2(25PRIMARY KEY,
  3       product_price    NUMBER(4,2),
  4       quantity_on_hand NUMBER(5,0),
  5       last_stock_date  DATE
  6       );

Table created.

SQL>
SQL> INSERT INTO product VALUES ('Product 1', 99,  1,    '15-JAN-03');

row created.

SQL> INSERT INTO product VALUES ('Product 2', 75,  1000'15-JAN-02');

row created.

SQL> INSERT INTO product VALUES ('Product 3', 50,  100,  '15-JAN-03');

row created.

SQL> INSERT INTO product VALUES ('Product 4', 25,  10000null);

row created.

SQL> INSERT INTO product VALUES ('Product 5', 9.95,1234'15-JAN-04');

row created.

SQL> INSERT INTO product VALUES ('Product 6', 45,  1,    TO_DATE('December 31200811:30 P.M.','Month dd, YYYY, HH:MI P.M.'));

row created.

SQL>
SQL>
SQL> DESC product;
 Name                                                  Null?    Type
 ----------------------------------------------------- -------- ------------------------------------
 PRODUCT_NAME                                          NOT NULL VARCHAR2(25)
 PRODUCT_PRICE                                                  NUMBER(4,2)
 QUANTITY_ON_HAND                                               NUMBER(5)
 LAST_STOCK_DATE                                                DATE

SQL>
SQL> ALTER TABLE product ADD data_load_date VARCHAR2(8NULL;

Table altered.

SQL>
SQL>
SQL> ALTER TABLE product MODIFY data_load_date DATE;

Table altered.

SQL>
SQL> DESC product;
 Name                                                  Null?    Type
 ----------------------------------------------------- -------- ------------------------------------
 PRODUCT_NAME                                          NOT NULL VARCHAR2(25)
 PRODUCT_PRICE                                                  NUMBER(4,2)
 QUANTITY_ON_HAND                                               NUMBER(5)
 LAST_STOCK_DATE                                                DATE
 DATA_LOAD_DATE                                                 DATE

SQL>
SQL>
SQL> UPDATE product SET data_load_date = '15-DEC-2003';

rows updated.

SQL>
SQL> DESC product;
 Name                                                  Null?    Type
 ----------------------------------------------------- -------- ------------------------------------
 PRODUCT_NAME                                          NOT NULL VARCHAR2(25)
 PRODUCT_PRICE                                                  NUMBER(4,2)
 QUANTITY_ON_HAND                                               NUMBER(5)
 LAST_STOCK_DATE                                                DATE
 DATA_LOAD_DATE                                                 DATE

SQL>
SQL> ALTER TABLE product MODIFY data_load_date NOT NULL;

Table altered.

SQL>
SQL> DESC product;
 Name                                                  Null?    Type
 ----------------------------------------------------- -------- ------------------------------------
 PRODUCT_NAME                                          NOT NULL VARCHAR2(25)
 PRODUCT_PRICE                                                  NUMBER(4,2)
 QUANTITY_ON_HAND                                               NUMBER(5)
 LAST_STOCK_DATE                                                DATE
 DATA_LOAD_DATE                                        NOT NULL DATE

SQL>
SQL>
SQL>
SQL> drop table product;

Table dropped.

SQL>
SQL>
6. 11. NOT NULL
6. 11. 1. Not NULL column
6. 11. 2. Alter a table column to 'not null'
6. 11. 3. Add 'NOT NULL' constraint to column with NULL value
6. 11. 4. Change null status of an existing column
6. 11. 5. Alter not null and null contraints
6. 11. 6. ORA-01400: cannot insert NULL into
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