Not NULL column : NOT NULL « Table « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Table » NOT NULL 
6. 11. 1. Not NULL column
SQL>
SQL> CREATE TABLE myTable (
  2       name  VARCHAR2(25NOT NULL,
  3       price NUMBER(4,2)  NOT NULL,
  4       start_date DATE);

Table created.

SQL>
SQL> INSERT INTO myTable VALUES ('Product Name 1', 1, NULL);

row created.

SQL>
SQL> SELECT FROM myTable;


NAME                           PRICE START_DAT
------------------------- ---------- ---------
Product Name 1                     1

SQL> drop table myTable;

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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