The following lines were added (+) and removed (-):
== Primary Commands ==* SELECT - extracts data from a database* UPDATE - updates data in a database* DELETE - deletes data from a database* INSERT INTO - inserts new data into a database* CREATE DATABASE - creates a new database* ALTER DATABASE - modifies a database* CREATE TABLE - creates a new table* ALTER TABLE - modifies a table* DROP TABLE - deletes a table* CREATE INDEX - creates an index (search key)* DROP INDEX - deletes an index