Default Column Values in Oracle.

In oracle you can use default value of a column. If the value is not entered explicitly then implicitly default value is set to the column value. To demonstrate I have made a table TEST_DEFAULT_VALUE. I have given column a,b,c to default value while table creation. Later I modified column f to default value.

1)Create table.
SQL> CREATE TABLE TEST_DEFAULT_VALUE(A NUMBER DEFAULT 1, B VARCHAR2(1) DEFAULT 'M', C DATE DEFAULT SYSDATE,E NUMBER,F NUMBER);
Table created.

2)Alter Table to modify column e and assign a default value.
SQL> ALTER TABLE TEST_DEFAULT_VALUE MODIFY (E DEFAULT 99999);
Table altered.

3)Just enter single value to column f.
SQL> INSERT INTO TEST_DEFAULT_VALUE (F) VALUES(100);
1 row created.

4)Now query table to get data.
SQL> SELECT * FROM TEST_DEFAULT_VALUE;

A B C E F
---------- - --------- ---------- ----------
1 M 02-JUN-08 99999 100

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