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  • oracle窗口函数中range interval的使用

    oracle窗口函数中range interval配合一般用来针对指定时间范围进行统计。其中range表示范围,between...and 表示之前的范围和之后的范围 , CURRENT ROW表示当前行,INTERVAL '1'  day/month/year preceding/following 表示时间范围的选择。

    --求采购订单成交记录中 同物料过去一年的采购平均单价

    SELECT
    W_PURCH_SCHEDULE_LINE_F.PRODUCT_WID,
    W_PRODUCT_D.Prod_Name, --item name
    W_PURCH_SCHEDULE_LINE_F.UNIT_PRICE,
    W_DAY_D.DAY_DT ORDER_DT,
    W_PURCH_SCHEDULE_LINE_F.PURCH_ORDER_NUM,
    W_PURCH_SCHEDULE_LINE_F.PURCH_ORDER_ITEM,
    W_PURCH_SCHEDULE_LINE_F.PURCH_SCHEDULE_NUM,
    W_PURCH_SCHEDULE_LINE_F.RELEASE_NUM,
    AVG(W_PURCH_SCHEDULE_LINE_F.UNIT_PRICE)OVER(PARTITION BY W_PURCH_SCHEDULE_LINE_F.PRODUCT_WID ORDER BY TRUNC(W_DAY_D.DAY_DT) RANGE BETWEEN INTERVAL '1' year preceding and current row) AVG_PRICE_PAST
    FROM W_PURCH_SCHEDULE_LINE_F,
    W_PRODUCT_D,
    W_DAY_D
    WHERE
    W_PURCH_SCHEDULE_LINE_F.PRODUCT_WID=W_PRODUCT_D.ROW_WID
    AND W_PURCH_SCHEDULE_LINE_F.ORDERED_ON_DT_WID=W_DAY_D.ROW_WID

    --求采购订单成交记录中 同物料未来一个月的采购平均单价

    SELECT 

    W_PURCH_SCHEDULE_LINE_F.PRODUCT_WID,
    W_PRODUCT_D.Prod_Name, --item name
    W_PURCH_SCHEDULE_LINE_F.UNIT_PRICE,
    W_DAY_D.DAY_DT ORDER_DT,
    W_PURCH_SCHEDULE_LINE_F.PURCH_ORDER_NUM,
    W_PURCH_SCHEDULE_LINE_F.PURCH_ORDER_ITEM,
    W_PURCH_SCHEDULE_LINE_F.PURCH_SCHEDULE_NUM,
    W_PURCH_SCHEDULE_LINE_F.RELEASE_NUM,
    AVG(W_PURCH_SCHEDULE_LINE_F.UNIT_PRICE)OVER(PARTITION BY W_PURCH_SCHEDULE_LINE_F.PRODUCT_WID ORDER BY TRUNC(W_DAY_D.DAY_DT) RANGE BETWEEN current row and INTERVAL '1' month following) AVG_PRICE_PAST
    FROM W_PURCH_SCHEDULE_LINE_F,
    W_PRODUCT_D, 
    W_DAY_D
    WHERE
    W_PURCH_SCHEDULE_LINE_F.PRODUCT_WID=W_PRODUCT_D.ROW_WID
    AND W_PURCH_SCHEDULE_LINE_F.ORDERED_ON_DT_WID=W_DAY_D.ROW_WID

    --求采购订单成交记录中 同物料5天内的采购平均单价

    SELECT 

    W_PURCH_SCHEDULE_LINE_F.PRODUCT_WID,
    W_PRODUCT_D.Prod_Name, --item name
    W_PURCH_SCHEDULE_LINE_F.UNIT_PRICE,
    W_DAY_D.DAY_DT ORDER_DT,
    W_PURCH_SCHEDULE_LINE_F.PURCH_ORDER_NUM,
    W_PURCH_SCHEDULE_LINE_F.PURCH_ORDER_ITEM,
    W_PURCH_SCHEDULE_LINE_F.PURCH_SCHEDULE_NUM,
    W_PURCH_SCHEDULE_LINE_F.RELEASE_NUM,
    AVG(W_PURCH_SCHEDULE_LINE_F.UNIT_PRICE)OVER(PARTITION BY W_PURCH_SCHEDULE_LINE_F.PRODUCT_WID ORDER BY TRUNC(W_DAY_D.DAY_DT) RANGE BETWEEN INTERVAL '2' day preceding and INTERVAL '1' day following) AVG_PRICE_PAST
    FROM W_PURCH_SCHEDULE_LINE_F,
    W_PRODUCT_D, 
    W_DAY_D
    WHERE
    W_PURCH_SCHEDULE_LINE_F.PRODUCT_WID=W_PRODUCT_D.ROW_WID
    AND W_PURCH_SCHEDULE_LINE_F.ORDERED_ON_DT_WID=W_DAY_D.ROW_WID

    备注:oracle将查找当前采购日期前2天,后2天范围内的记录,并出去单价的avg值。

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  • 原文地址:https://www.cnblogs.com/fjhh/p/4036618.html
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