Oracle教程 2023-02-23

Oracle 视图 ALL_HIER_LEVELS_AE 官方解释，作用，如何使用详细说明

ALL_HIER_LEVELS_AE视图是Oracle提供的代表分析外部表存储结构层次结构的一个视图。通过它，可以直接查询分析外部表存储结构层次结构的信息，包括层次号、父层次号、层次的列和事实表的列等。

使用ALL_HIER_LEVELS_AE视图，可以查询分析外部表存储结构层次结构的信息，以及分析外部表存储层次数量，统计层次的列等。通过ALL_HIER_LEVELS_AE视图，可以简便易用地查询分析外部表存储结构层次结构的信息。

要使用ALL_HIER_LEVELS_AE视图，可以通过SELECT语句查询其中信息，例如：SELECT * FROM ALL_HIER_LEVELS_AE WHERE TABLE_NAME=’table_name’; 其中，table_name表示要查询的分析外部表存储结构层次结构的名称。

此外，也可以通过其他数据库视图来查询ALL_HIER_LEVELS_AE视图，例如：SELECT column1,column2 FROM DBA_HIER_LEVELS_AE WHERE TABLE_NAME=’table_name’;

ALL_HIER_LEVELS_AE describes the levels of the hierarchies (across all editions) accessible to the current user.

Related Views

DBA_HIER_LEVELS_AE describes the levels of all hierarchies (across all editions) in the database.
USER_HIER_LEVELS_AE describes the levels of the hierarchies (across all editions) owned by the current user. This view does not display the OWNER column.

Column	Datatype	NULL	Description
`OWNER`	`VARCHAR2(128)`	`NOT NULL`	Owner of the hierarchy
`HIER_NAME`	`VARCHAR2(128)`	`NOT NULL`	Name of the hierarchy
`LEVEL_NAME`	`VARCHAR2(128)`	`NOT NULL`	Name of hierarchy level
`ORDER_NUM`	`NUMBER`	`NOT NULL`	Order of the level in the list of hierarchy levels
`ORIGIN_CON_ID`	`NUMBER`		The ID of the container where the data originates. Possible values include: `0`: This value is used for rows in non-CDBs. This value is not used for CDBs. n: This value is used for rows containing data that originate in the container with container ID n (n = 1 if the row originates in root).
`EDITION_NAME`	`VARCHAR2(128)`		Name of the application edition where the hierarchy is defined

Note:

This view is available starting with Oracle Database release 21c, version 21.5.