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_NAME ON TABLE_NAME (COLUMN_NAME)
Description: Creates an index on a table
CREATE ROLE
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