DESCRIBE PROJECTION POLICY¶

描述有关投影策略的详细信息，包括创建日期、名称和 SQL 表达式。

DESCRIBE 可以缩写为 DESC。

另请参阅：: 投影策略 DDL 引用

语法¶

DESC[RIBE] PROJECTION POLICY <name>

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参数¶

name

指定要描述的投影策略的标识符。

如果标识符包含空格或特殊字符，则整个字符串必须放在双引号内。放在双引号内的标识符也区分大小写。

有关更多信息，请参阅标识符要求。

访问控制要求¶

用于执行此 SQL 命令的角色必须至少具有以下一项权限：

权限	对象	备注
APPLY PROJECTION POLICY	账户
APPLY	投影策略
OWNERSHIP	投影策略	OWNERSHIP is a special privilege on an object that is automatically granted to the role that created the object, but can also be transferred using the GRANT OWNERSHIP command to a different role by the owning role (or any role with the MANAGE GRANTS privilege).

The USAGE privilege on the parent database and schema are required to perform operations on any object in a schema. Note that a role granted any privilege on a schema allows that role to resolve the schema. For example, a role granted CREATE privilege on a schema can create objects on that schema without also having USAGE granted on that schema.

有关创建具有指定权限集的自定义角色的说明，请参阅创建自定义角色。

有关对安全对象执行 SQL 操作的相应角色和权限授予的一般信息，请参阅访问控制概述。

有关投影策略 DDL 和权限的其他详细信息，请参阅权限和命令。

使用说明¶

To post-process the output of this command, you can use the pipe operator (->>) or the RESULT_SCAN function. Both constructs treat the output as a result set that you can query.

The output column names for this command are generated in lowercase. If you consume a result set from this command with the pipe operator or the RESULT_SCAN function, use double-quoted identifiers for the column names in the query to ensure that they match the column names in the output that was scanned. For example, if the name of an output column is type, then specify "type" for the identifier.

示例¶

描述投影策略：

DESC PROJECTION POLICY do_not_project;

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