语句如下：

    1. create_tenant_stmt:
    2.     CREATE TENANT [IF NOT EXISTS] tenant_name
    3.     [tenant_option_list];
    5. alter_tenant_stmt:
    6.     ALTER TENANT tenant_name
    7.     [SET] [tenant_option_list];
    9. drop_tenant_stmt:
    10.     DROP TENANT [IF EXISTS] tenant_name;
    12. tenant_option_list:
    13.     tenant_option [, tenant_option ...]
    15. tenant_option:
    16.       default_charset
    17.     | default_collate
    18.     | primary_zone
    19.     | zone_list
    20.     | replica_num
    21.     | default_tablegroup
    22.     | RESOURCE_POOL_LIST [=] ('pool_name')
    23.     | {READ ONLY | READ WRITE}
    24.     | comment