在对多表进行更新时，不支持ORDER BY、LIMIT。

MySQL> update Subscribers2 s,tmp_Subscribers_01 t  set s.date='2015-01-01',
    -> s.LastAccessTimeStamp=unix_timestamp(date '2015-01-01')
    -> where s.MSISDN=t.MSISDN and t.id between 1 and 5000 limit 2000;
ERROR 1221 (HY000): Incorrect usage of UPDATE and LIMIT

mysql> update Subscribers2 s,tmp_Subscribers_01 t  set s.date='2015-01-01',
    -> s.LastAccessTimeStamp=unix_timestamp(date '2015-01-01')
    -> where s.MSISDN=t.MSISDN and t.id between 1 and 5000 order by s.date;
ERROR 1221 (HY000): Incorrect usage of UPDATE and ORDER BY

当前题目：MySQL多表更新的限制
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