SQL Overview
SQL Overview --============================================================== =================================================================== SQL Overview :- These commands can be classified into the following groups based on their nature. DDL - Data Definition Language -------------------------------- 1 CREATE :- Creates a new table, a view of a table, or other object in the database. 2 ALTER :- Modifies an existing database object, such as a table. 3 DROP :- Deletes an entire table, a view of a table or other objects in the database. Ex:- CREATE TABLE XXSD_TEST_TL( EMP_NO VARCHAR2(10), EMP_NAME VARCHAR2(100), SALARY NUMBER ) select * from XXSD_TEST_TL ALTER TABLE XXSD_TEST_TL ADD ( DOB DATE) DROP TABLE XXSD_TEST_TL --===================================================================== DML - Data Manipulation Language -------------------------------- 1 SELECT :- Retrieves certain records from one or more tables. 2 INSERT :- Creates ...