This statement is used to display the execution of the specified export task

    grammar:

    1.   2. If STATE is specified, matches EXPORT state
    3.   4. If LIMIT is specified, limit matching records are displayed. Otherwise show all

    1. Show all export tasks of default db

    2. Display the export tasks of the specified db, sorted by StartTime in descending order

      2. Display the export task of the specified db and specified job_id

        1.   SHOW EXPORT FROM example_db WHERE ID = job_id;

      3. Display the specified db and specify the export task of the label