Oracle SQL Tutorial : How to create Id with AUTO INCREMENT in Oracle PL SQL

Oracle SQL Tutorial
Oracle tutorial: How to create Id with AUTO INCREMENT in Oracle

oracle tutorial for beginners

sequence in oracle

identity key in sql


In this Oracle tutorial , we can create an auto increment field using ‘sequence’
object that can be assigned as primary keys.

Using Oracle ‘sequence’ object, you can generate new values for a column.
An Oracle sequence is an object like a table or a stored procedure.

Examples


CREATE SEQUENCE SYSTEM.MYSEQ
START WITH 1
MAXVALUE 999999999999999999999999999
MINVALUE 1
NOCYCLE
CACHE 20
NOORDER;


CREATE OR REPLACE TRIGGER TR_CITY BEFORE INSERT ON CITY FOR EACH ROW
BEGIN SELECT LPAD(LTRIM(RTRIM(TO_CHAR(myseq.NEXTVAL))),10,'0') INTO :NEW.id FROM DUAL;

END;
/




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identity column