Oracle Database DML DDL and TCL
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The document outlines Oracle's DDL (Data Definition Language), DML (Data Manipulation Language), and DCL (Data Control Language). It explains key commands including creating, altering, dropping tables, and managing user privileges. Examples of SQL statements for each operation are provided to illustrate their usage.
Oracle Database DML DDL and TCL
- 1. Oracle DDL ,DML & DCL ABDUL REHMAN
- 2. DDL • SCHEMA – A database schema is the skeleton structure that represents the logical view of the entire database. It defines how the data is organized and how the relations among them are associated. • DATA DEFINATION LANGUAGE – Are collection of those statements which are DIRECTLY related to database Schema • DDL STATEMENTS ARE – CREATE, ALTER, DROP, REPLACE AND TRUNCATE
- 3. CREATE • Used To Create Objects Like – CREATE TABLE – CREATE FUNCTION – CREATE VIEW – Etc. CREATE TABLE STUDENT ( STDROLLNO number(5) primary key, NAME varchar2(20), CAST varchar2(20) ); STDROLLNO NAME CAST
- 4. ALTER • Use to Alter Objects like – ALTER TABLE – ALTER USER – ALTER DATABASE ALTER TABLE STUDENT ADD ( ADDRESS NVARCHAR2(50) ); STDROLLNO NAME CASTSTDROLLNO NAME CAST ADDRESS
- 5. DROP • Use to Drop Objects like – DROP TABLE – DROP USER – DROP FUNCTION – Etc CREATE TABLE EXTRA ( NUM number(5) primary key, NAME nvarchar2(20) ); NUM NAME DROP TABLE EXTRA;
- 6. REPLACE • Use to Rename table names. RENAME STUDENT TO STUDENTS; STDROLLNO NAME CAST ADDRESS
- 7. TRUNCATE • Use to truncate (delete all rows) a table.
- 8. DML • Data manipulation language (DML) • Are the statements query and manipulate data in existing schema objects. – INSERT – UPDATE – DELETE
- 9. INSERT • Insert into STUDENTS values (3,’Atif’,’Bhatti’,’UK’); • Insert into STUDENTS values (13,’Ahsan’,’Khanzada’,’SK’); STDROLLNO NAME CAST ADDRESS 3 Atif Bhatti UK 13 Ahsan Khanzada SK
- 10. UPDATE • USED TO MODIFY DATA IN DB – UPDATE STUDENTS SET ADDRESS=‘NAWABSHAH’ WHERE NAME=‘Atif”; STDROLLNO NAME CAST ADDRESS 3 Atif Bhatti UK 13 Ahsan Khanzada SK STDROLLNO NAME CAST ADDRESS 3 Atif Bhatti Nawabshah 13 Ahsan Khanzada SK
- 11. DELETE • Use the DELETE statement to delete the rows from existing tables which are in your schema or if you have DELETE privilege on them. • DELETE STUDENTS WHERE NAME=‘Ahsan’; STDROLLNO NAME CAST ADDRESS 3 Atif Bhatti Nawabshah 13 Ahsan Khanzada SK
- 12. DCL • Data Control Language (DCL) Statements – Data Control Language Statements are used to grant privileges on tables, views, procedures to other users or roles. – The DCL statements are • GRANK • REVOKE
- 13. GRANT • Use to grant privileges to other users or roles. • grant select, update, insert on STUDENTS to David;
- 14. REVOKE • Use to take back privileges granted to other users and roles. • revoke select, update, insert on emp from David;