You can use the USER_DISPLAY_NAME function to convert the display name of an account in Hologres into the email address of an Alibaba Cloud account or a string that indicates a RAM user. This topic describes how to use the USER_DISPLAY_NAME function in Hologres.
Syntax
The following code shows the syntax of the USER_DISPLAY_NAME function:
SELECT user_display_name ( user_name )Parameters
The following table describes the parameter of the USER_DISPLAY_NAME function.
The return value is the email address of the Alibaba Cloud account such as
| Parameter | Description |
| user_name | The ID of an Alibaba Cloud account or a RAM user in the format of a string that consists mostly of digits. For example, the ID of an Alibaba Cloud account can be 13532241323xxx and the ID of a RAM user can be p4_23402030200xxx. |
xx@aliyun.com or a string that indicates the RAM user such as RAM$mainaccount:subuser or RAM$public.Examples
The following sample code provides examples on how to use the USER_DISPLAY_NAME function to convert the display name of an account in Hologres into the email address of an Alibaba Cloud account or a string that indicates a RAM user:
SELECT user_display_name ('13532241323xxx');
SELECT rolname, user_display_name(rolname) FROM pg_roles;