Monday, October 22, 2012

SQL Features - Primary Key Sequence Handling

When you define a table you can assign a default value to a column based on a sequence.

1. Create a Sequence (For ex: empid)
2. Create a table script where primary key column has a default based on the Next Value of the sequence created in Step 1

For Ex:
Create table EMPLOYEES
(EMPID number default empID.NEXTVAL primary key,
column2 columntype);

Advantage: No need to create a trigger to fill the column with the next value from a sequence, you just follow above steps.

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