AUTO_INCREMENT id in Pl/SQL
Sometimes while creating a table we do not have a unique identifier within the table hence we face difficulty in choosing the Primary Key. To resolve such an issue, we’ve to provide unique keys to every record manually, but this is often also a tedious task. So we can use the Auto Increment feature that automatically generates a numerical Primary key value for every new record inserted. To use the auto-increment feature we have to make the auto-increment field with the sequence object which successively generates several sequences.
Syntax:
CREATE SEQUENCE sequence_name MINVALUE 1 START WITH 1
INCREMENT BY 1
CACHE 10;
In the above syntax,
- sequence_name: Refers to the name of the sequence object we would like to produce.
- START WITH: Followed by the starting value that we would like to use. Here we have provided 1 as the starting value.
- INCREMENT BY: Followed by the value by which you want to increment. Here we want to increase the subsequent keys by 1.
- CACHE: Followed by the maximum number of values to be stored for faster access.
How to Create id With AUTO_INCREMENT in PL/SQL?
PL/SQL, short for Procedural Language/Structured Query Language, combines SQL capabilities with procedural programming. It supports variable declaration, control flow structures, functions, records, cursors, procedures, and triggers.
PL/SQL features a block structure with optional sections for variable declarations and exception handling. Its execution section handles SQL queries seamlessly. Overall, PL/SQL offers a robust environment for developing database-centric applications with enhanced control and error-handling capabilities.