SQL 数据定义语言（DDL）创建、修改、重命名或销毁数据库对象并对数据库中系统目录表中的行进行相应的修改。
- ALTER ACCESS_METHOD
- ALTER FRAGMENT
- ALTER FUNCTION
- ALTER INDEX
- ALTER PROCEDURE
- ALTER ROUTINE
- ALTER SEQUENCE
- ALTER SECURITY LABEL COMPONENT
- ALTER TABLE
- ALTER TRUSTED CONTEXT
- ALTER USER
- CLOSE DATABASE
- CREATE ACCESS_METHOD
- CREATE AGGREGATE
- CREATE CAST
- CREATE DATABASE
- CREATE DEFAULT USER
- CREATE DISTINCT TYPE
- CREATE EXTERNAL TABLE
- CREATE FUNCTION
- CREATE FUNCTION FROM
- CREATE INDEX
- CREATE OPAQUE TYPE
- CREATE OPCLASS
- CREATE PROCEDURE
- CREATE PROCEDURE FROM
- CREATE ROLE
- CREATE ROUTINE FROM
- CREATE ROW TYPE
- CREATE SCHEMA
- CREATE SECURITY LABEL
- CREATE SECURITY LABEL COMPONENT
- CREATE SECURITY POLICY
- CREATE SEQUENCE
- CREATE SYNONYM
- CREATE TABLE
- CREATE TEMP TABLE
- CREATE TRIGGER
- CREATE TRUSTED CONTEXT
- CREATE USER
- CREATE VIEW
- CREATE XADATASOURCE
- CREATE XADATASOURCE TYPE
- DROP ACCESS_METHOD
- DROP AGGREGATE
- DROP CAST
- DROP DATABASE
- DROP FUNCTION
- DROP INDEX
- DROP OPCLASS
- DROP PROCEDURE
- DROP ROLE
- DROP ROUTINE
- DROP ROW TYPE
- DROP SECURITY
- DROP SEQUENCE
- DROP TRUSTED CONTEXT
- DROP SYNONYM
- DROP TABLE
- DROP TRIGGER
- DROP TYPE
- DROP USER
- DROP VIEW
- DROP XADATASOURCE
- DROP XADATASOURCE TYPE
- RENAME COLUMN
- RENAME DATABASE
- RENAME INDEX
- RENAME SECURITY
- RENAME SEQUENCE
- RENAME TABLE
- RENAME TRUSTED CONTEXT
- RENAME USER
- TRUNCATE
- UPDATE STATISTICS