Appendix A. Common SQL Commands
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.
SQL Statements
ALTER TABLE
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
COMMIT [ TRANSACTION ]
Description: Saves a transaction to the database.
CREATE INDEX
CREATE INDEX INDEX_NAMEON TABLE_NAME (COLUMN_NAME)
Description: Creates an index on a table.
CREATE ROLE
CREATE ROLE ROLE NAME[ WITH ADMIN [CURRENT_USER | CURRENT_ROLE]] ...
Get Sams Teach Yourself SQL in 24 Hours, Fifth Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
