如何在Teradata中向现有表DDL添加注释？

Question

我正在向表中添加一些新列,并希望为未来的开发人员添加表DDL的文档.怎么会这样呢？

Answer 1

通用语法:

COMMENT ON {OBJECT} {OBJECTNAME} AS '{255 characters of text};

详细语法示例:

COMMENT ON TABLE {DATABASE}.{TABLENAME} AS '{255 characters of text}';
COMMENT ON COLUMN {DATABASENAME}.{TABLENAME}.{COLUMNNAME} AS '{255 characters of text}';
COMMENT ON USER {USERNAME} AS '{255 characters of text}';
COMMENT ON DATABASE {DATABASENAME} AS '{255 characters of text}';