This appendix details some of the most common SQL commands that you will use. As we have stated throughout the book, check your database documentation, because some of the statements vary depending upon your implementation.
ALTER TABLE TABLE_NAME[MODIFY | ADD | DROP] [COLUMN COLUMN_NAME][DATATYPE|NULL NOT NULL] [RESTRICT|CASCADE][ADD | DROP] CONSTRAINT CONSTRAINT_NAME]
Description: Alters a table’s columns.
COMMIT [ TRANSACTION ]
Description: Saves a transaction to the database.
CREATE INDEX INDEX_NAMEON TABLE_NAME (COLUMN_NAME)
Description: Creates an index on a table.
CREATE ROLE ROLE NAME[ WITH ADMIN [CURRENT_USER | CURRENT_ROLE]] ...