Oracle Auto Increment Primary Key Guide

The way to implement an auto-increment primary key in Oracle is by using a sequence. A sequence is an independent object that can generate unique incrementing numeric sequences. When creating a table, a sequence can be used to define the default value of the primary key field. Here is an example:

1. Create a sequence:
2. Generate a sequence named seq_name starting from 1, incrementing by 1, with a minimum value of 1, a maximum value of 9999999999, and caching 20 numbers.
3. In this, seq_name represents the name of the sequence, START WITH specifies the initial value of the sequence, INCREMENT BY determines the increment step of the sequence, MINVALUE and MAXVALUE set the minimum and maximum values of the sequence, and CACHE indicates the number of sequence values to cache.
4. When creating a table, specify a default value for the primary key field using a sequence.
5. Create a table named “table_name” with an id column that automatically increments using the sequence “seq_name” and is set as the primary key.
6. This way, whenever a new record is inserted into the table, the next unique value will be automatically retrieved from the sequence as the value for the primary key field.