You can create autoincrement column in oracle in two ways.<\/p>\n
Method 1 : Using sequence<\/strong><\/p>\n Table Creation Query<\/em><\/p>\n Sequence Creation Query<\/em><\/p>\n The above code creates a sequence for table tblusers with name tblusers_userid_seq with start value of 1 and limit 999999999999999999999999999.<\/p>\n Insertion Query<\/em><\/p>\n Method 2 : Using Trigger<\/strong> Before creating trigger you should make the auto increment column as primary key.For that the code is as below<\/p>\n The Creation of sequence and trigger is as follows<\/p>\n Now during insertion there is no need to worry about the auto increment column and the insert query no need to contain the Id column as below<\/p>\n You can create autoincrement column in oracle in two ways. Method 1 : Using sequence Table Creation Query CREATE TABLE tblusers(UserId INT, UserName VARCHAR(50)); Sequence Creation Query CREATE SEQUENCE tblusers_userid_seq MINVALUE 1 MAXVALUE 999999999999999999999999999 START WITH 1 INCREMENT BY 1 CACHE 20; The above code creates a sequence for table tblusers with name tblusers_userid_seq with… Continue reading \r\n CREATE TABLE tblusers(UserId INT, UserName VARCHAR(50));\r\n<\/pre>\n
\r\n CREATE SEQUENCE tblusers_userid_seq \r\n MINVALUE 1 MAXVALUE 999999999999999999999999999 \r\n START WITH 1 INCREMENT BY 1 CACHE 20;\r\n<\/pre>\n
\r\n INSERT INTO tblusers(UserId, UserName) VALUES (tblusers_userid_seq.nextVal, 'John')\r\n<\/pre>\n
\nIn Method 2 we can use triggers to carry out auto increment when rows are added to the table.<\/p>\n\r\n ALTER TABLE tblusers ADD (\r\n CONSTRAINT UserId_pk PRIMARY KEY (UserId));\r\n<\/pre>\n
\r\nCREATE SEQUENCE tblusers_userid_seq; \r\nCREATE OR REPLACE TRIGGER tblusers_userid_trigg \r\nBEFORE INSERT ON tblusers \r\nFOR EACH ROW\r\nBEGIN\r\n SELECT tblusers_userid_seq.NEXTVAL\r\n INTO :new.UserId\r\n FROM dual;\r\nEND;\r\n<\/pre>\n
\r\n INSERT INTO tblusers(UserName) VALUES ('John')\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"