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我正在为某件事而挣扎,而且没有太多时间来自己弄清楚。从两个级联列表中获取最大值(DateTime)ORACLE
我的查询:
Select distinct d.delivery_bay_code,dt.diary_type_desc, d.delivery_datetime, ddo.order_no , ddo.company_id_no, ddo.no_of_cartons, s.supplier_name, c.company_name, sk.sku_desc, (pod.deliver_not_after_date)||' '||(pod.deliver_not_before_date)as delivery_window
from diary d , dc_diary_order ddo , purch_order po ,purch_order_carton_sku pocs ,sku sk, purch_order_date pod,supplier s , diary_type dt , company c
where ddo.diary_entry_id_no = d.diary_entry_id_no
and po.order_no = ddo.order_no
and po.company_id_no = ddo.company_id_no
and s.supplier_id_no = po.supplier_id_no
and s.company_id_no = po.company_id_no
and dt.diary_type_code = d.diary_type_code
and c.company_id_no = po.company_id_no
and po.order_no = pocs.order_no
and pocs.sku_id_no = sk.sku_id_no
and po.company_id_no = 2
and ddo.order_no = 1999
order by delivery_datetime;
这个查询带回2条记录,其中只有delivery_window
不同。例如13/APR/11 13/APR/11 and 12/APR/11 12/APR/11
我希望它仅带回最大日期时间(最新日期)。
例如:select max(delivery_datetime) from diary;
现在,我已经尽了上面的查询是这样的:
select... max(pod.deliver_not_after_date)||' '||(pod.deliver_not_before_date)as delivery_window ... from
,但我得到的错误ORA-00937: not a single-group group function
:那是SQL的基础上,如果你想最大记录中,你需要把非在你的查询中,你使用了不同的子句,它可以给你多个记录,那么如果你希望你可以使用分析函数,那么获得最大交付日期的标准是什么? – 2013-03-19 08:29:31
仅供参考:最大值将应用仅限于max(date1)。您不会从日期范围中获取最大值(日期1)||' “|| DATE2。 – Art 2013-03-19 15:09:48