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 DOMAIN

CREATE DOMAIN DOMAIN_NAME AS DATA_TYPE [ NULL | NOT NULL]

Description: Creates a domain—an object that is associated with a data type and constraints.

CREATE INDEX

CREATE INDEX INDEX_NAME
ON TABLE_NAME (COLUMN_NAME)

Description: Creates an index on a table.

CREATE ROLE

CREATE ROLE ROLE NAME 
[ WITH ADMIN [CURRENT_USER | CURRENT_ROLE]]

Description: Creates a database role to which system and object privileges can be granted ...

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