To copy a table without copying its data, you can simply use this SQL statement:

CREATE TABLE xx_oraask_tbl_bkp AS SELECT * FROM xx_oraask_tbl WHERE 1=0;

But there is a limitation to using the above statement that you have to pay attention to:

The following database objects are not copied to the new version of your table

• Sequences
• Triggers
• Indexes
• Identity column
• Some constraints
• Partitioning

Or you can use another way to do this:

SELECT dbms_metadata.get_ddl( 'TABLE', 'xx_oraask_tbl' ) FROM DUAL;

In the above statement, you will get the DDL statement of a specified table, and then you can easily change the table name, the indexes, etc.