If you hold CONTROL privilege on a table, you can update values that pertain to that table, but if you hold explicit DBADM authority on the database, you can change any updatable column.
如果在某个表上拥有CONTROL权限，那么就可以更新属于该表的值，但是如果拥有数据库上显式的DBADM授权的话，那么您可以更新任何可更新的列。
The database server automatically issues the prepare statement to update any prepared objects that reference the table.
数据库服务器自动发出PREPARE命令，更新引用该表的任何编译过的对象。
If a row has already been updated or deleted, then this row cannot be joined again with any source table row for another update or delete again.
如果一个行已被更新或者删除，那么不能针对该行再次更新与删除，再次与任何源表联接。
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