mysql中You can't specify target table for update in FROM clause错误

delete from DEP_SYSTEM_PORTLET_SETTINGS where ID in (
        select ID from
        DEP_SYSTEM_PORTLET_SETTINGS 
        group by (USER_ID) HAVING count(USER_ID) >1
)

delete from DEP_SYSTEM_PORTLET_SETTINGS where ID in (
        select ID from (
        select ID from
        DEP_SYSTEM_PORTLET_SETTINGS 
        group by (USER_ID) HAVING count(USER_ID) >1
        ) C
)