mysql 错误代码 1248
问题描述：
我收到错误代码 1248，不知道为什么.提前致谢.
I am getting an error code 1248 and have no idea why. Thanks in advance.
select substr(cbt,1,8) day,
max((delta_GTP_InDataPktGn+delta_GTP_OutDataPktGn))/900
from
(
select a.cbt, a.datetime,
a.GTP_InDataPktGn - b.GTP_InDataPktGn as delta_GTP_InDataPktGn,
a.GTP_OutDataPktGn - b.GTP_OutDataPktGn as delta_GTP_OutDataPktGn
from
( select cbt, STR_TO_DATE(substr(cbt,1,12),'%Y%m%d%H%i') as datetime,
GTP_InDataPktGn,
GTP_OutDataPktGn
from sgsn_GTP
) a
right join
(
select cbt, STR_TO_DATE(substr(cbt,1,12),'%Y%m%d%H%i') as datetime,
GTP_InDataPktGn,
GTP_OutDataPktGn
from sgsn_GTP
)
on a.datetime = addtime(b.datetime,"00:15:00")
) z
where z.cbt between 20130429000000 and 20130430980000
group by day
答
Error 1248 is ER_DERIVED_MUST_HAVE_ALIAS，每个派生表都必须有自己的别名".
Error 1248 is ER_DERIVED_MUST_HAVE_ALIAS, "Every derived table must have its own alias".
您联接右侧的派生表没有别名:
The derived table on the right of your join has no alias:
right join
(
select cbt, STR_TO_DATE(substr(cbt,1,12),'%Y%m%d%H%i') as datetime,
GTP_InDataPktGn,
GTP_OutDataPktGn
from sgsn_GTP
)
-- ^ missing b