Technical Development - Tiveloper.

Using a Sequence ex) INSERT INTO department (department_id, department_name, location_id) VALUES (dept_deptid_seq.NEXTVAL, 'Support', 2500 ) Tip) View current value SELECT dept_deptid_seq.CURRVAL FROM dual; Caching Sequence Values - Using Cache function : faster access to those values. - Gaps in sequence values can occur when: A rollback occurs The system crashes A sequence is used in another ta..

Using a Sequence ex) INSERT INTO department (department_id, department_name, location_id) VALUES (dept_deptid_seq.NEXTVAL, 'Support', 2500 ) Tip) View current value SELECT dept_deptid_seq.CURRVAL FROM dual; Caching Sequence Values - Using Cache function : faster access to those values. - Gaps in sequence values can occur when: A rollback occurs The system crashes A sequence is used in another ta..

Can automatically generate unique numbers Is a sharable object Can be used to create a primary key value Replaces application code Speeds up the efficiency of accessing sequence values when cached in memeory SyntaxCREATE SEQUENCE sequence [INCREMENT BY n] [START WITH n] [{MAXVALUE n | NOMAXVALUE}] [{MINVALUE n | NOMAXVALUE}] [{CYCLE | NOCYCLE}] [{CACHE n | NOCACHE}]; default increment value : 1 ..

Can automatically generate unique numbers Is a sharable object Can be used to create a primary key value Replaces application code Speeds up the efficiency of accessing sequence values when cached in memeory SyntaxCREATE SEQUENCE sequence [INCREMENT BY n] [START WITH n] [{MAXVALUE n | NOMAXVALUE}] [{MINVALUE n | NOMAXVALUE}] [{CYCLE | NOCYCLE}] [{CACHE n | NOCACHE}]; default increment value : 1 ..

NEXTVAL : The NEXTVAL pseudocolumns is used to extract successive sequence numbers from a specified sequence. sequence.NEXTVAL CURRVAL : The CURRVAL pseudocolumn is used to refer to a sequence number that the current user has just generated. After you generated a sequence object, you have to call NEXTVAL first because the initiatied pointer of the sequence object is pointing the head of the obje..

NEXTVAL : The NEXTVAL pseudocolumns is used to extract successive sequence numbers from a specified sequence. sequence.NEXTVAL CURRVAL : The CURRVAL pseudocolumn is used to refer to a sequence number that the current user has just generated. After you generated a sequence object, you have to call NEXTVAL first because the initiatied pointer of the sequence object is pointing the head of the obje..

Table : Basic unit of storage; composed of rows Can be created at any time. View : Logically represents subsets of data from one or more tables Sequence : Generates numeric values Index : Imporves the performance of some queries Synonym : Gives alternative names to object

Table : Basic unit of storage; composed of rows Can be created at any time. View : Logically represents subsets of data from one or more tables Sequence : Generates numeric values Index : Imporves the performance of some queries Synonym : Gives alternative names to object