grantee_clause:
{ user [ IDENTIFIED BY password ]| role| PUBLIC}
  [, { user [ IDENTIFIED BY password ]| role| PUBLIC}]...
 
grant_object_privileges:
{ object_privilege | ALL [ PRIVILEGES ] }
[ (column [, column ]...) ]
[, { object_privilege | ALL [ PRIVILEGES ] }[ (column [, column ]...) ]]...
on_object_clause TO grantee_clause  [ WITH HIERARCHY OPTION ][ WITH GRANT OPTION ]

on_object_clause:
ON { [ schema. ] object
  | DIRECTORY directory_name
  | EDITION edition_name
  | MINING MODEL [schema.] mining_model_name
  | JAVA { SOURCE | RESOURCE } [ schema. ] object
  }

要记住"grant 权限 to 用户".
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权限的回收：
1、语法
REVOKE { revoke_system_privileges| revoke_object_privileges} ;

revoke_system_privileges：
{ system_privilege| role| ALL PRIVILEGES}
  [, { system_privilege
    | role
    | ALL PRIVILEGES
    }
  ]...
FROM grantee_clause

revoke_object_privileges：
{ object_privilege | ALL [ PRIVILEGES ] }
  [, { object_privilege | ALL [ PRIVILEGES ] } ]...
on_object_clause
FROM grantee_clause
[ CASCADE CONSTRAINTS | FORCE ]

grantee_clause：
{ user [ IDENTIFIED BY password ]
| role
| PUBLIC
}
  [, { user [ IDENTIFIED BY password ]
    | role
    | PUBLIC
    }
  ]...
 
on_object_clause：
ON { [ schema. ] object
  | DIRECTORY directory_name
  | EDITION edition_name
  | MINING MODEL [schema.] mining_model_name
  | JAVA { SOURCE | RESOURCE } [ schema. ] object
  }

记住"revoke 权限 from 用户"
-------------------------------------------------------------------------------
系统权限不能级联回收，对象权限可以级联回收。

-------------------------------------------------------------------------------------