Question

我一直在工作,看见对Oracle铅和滞后功能的同等功能。

矿砂的牵头人希望

LEAD(col1.date,1,ADD_MONTHS(col1.DATE,12)) 
OVER(Partition By tab.a,tab.b,tab.c Order By tab.a)-1 END_DATE

LAG(col1.DATE + 7,1,col1.DATE-1) 
OVER(partition by tab.a,tab.b Order By tab.b) LAG_DATE

任何更好的想法

Answer 1

我认为,你可以把以下文件作为基础并加以修改,以满足你们的需要:

SELECT CALENDAR_DATE
     , MAX(CALENDAR_DATE)
       OVER(PARTITION BY 1 ORDER BY CALENDAR_DATE
            ROWS BETWEEN 1 PRECEDING AND 1 PRECEDING) AS Lag_ --Yesterday
     , MIN(CALENDAR_DATE)
            OVER(PARTITION BY 1 ORDER BY CALENDAR_DATE
            ROWS BETWEEN 1 FOLLOWING AND 1 FOLLOWING) AS Lead_ --Tomorrow
FROM SysCalendar.CALENDAR
WHERE year_of_calendar = 2011
  AND month_of_year = 11

如在会前或之后没有记录,可在必要时与法语区委员会联系,则该联盟将返回。

EDIT In Teradata 16.00 LAG/LEAD functions were introduced.

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