数据定义语句

神通数据库中，数据定义语句具有如下功能：

创建、更改和删除模式对象和非模式对象

为用户或角色授权或收回权限

为对象增加注释

为对象创建或删除统计信息

神通数据库支持的数据定义语句如下表：

表65 神通数据库支持的数据定义语句

ALTER INDEX	ALTER FULLTEXT INDEX	ALTER STATISTICS
ALTER TABLE	ALTER TABLESPACE	ALTER TRIGGER
ALTER USER	COMMENT ON	CREATE DOMAIN
CREATE INDEX	CREATE PROCEDURE	CREATE ROLE
CREATE SCHEMA	CREATE SEQUENCE	CREATE STATISTICS
CREATE TABLE	CREATE TABLESPACE	CREATE TRIGGER
CREATE USER	CREATE VIEW	CREATE FULLTEXT INDEX
CREATE MATERIALIZED VIEW	CREATE CONTEXT	CREATE MATERIALIZED VIEW LOG
CREATE FUNCTION	DEALLOCATE	DEALLOCATE PREPARE
DECLARE	DROP INDEX	DROP PROCEDURE
DROP ROLE	DROP SCHEMA	DROP SEQUENCE
DROP STATISTICS	DROP TABLE	DROP TABLESPACE
DROP TRIGGER	DROP USER	DROP VIEW
DROP MATERIALIZED VIEW	DROP MATERIALIZED VIEW LOG	DROP CONTEXT
DROP DOMAIN	DROP FULLTEXT INDEX	GRANT ROLE
GRANT	OPTIMIZE FULLTEXT INDEX	REFRESH MATERIALIZED VIEW
REVOKE	UPDATE STATISTICS