Click here to view and discuss this page in DocCommentXchange. In the future, you will be sent there automatically.
构造表示空集的几何集合。
NEW ST_GeomCollection()
SQL/MM (ISO/IEC 13249-3: 2006) 标准功能
以下示例返回 1,指示值为空。
SELECT NEW ST_GeomCollection().ST_IsEmpty()