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  • sql 获取某一时段中每一天中最大的时间的一条记录

    SELECT *
    FROM (
    SELECT ROW_NUMBER() OVER(
    PARTITION BY CONVERT(CHAR(10), DataTime, 120) ORDER BY DataTime DESC
    ) AS rid,
    *
    FROM Hour_4684807221950341358
    ) AS t
    WHERE rid = 1

    --沉降监测1

    select * from (
    SELECT * FROM
    (SELECT *,ROW_NUMBER() OVER (PARTITION BY CONVERT(VARCHAR(10),DataTime,23),HFCodeID ORDER BY DataTime DESC) AS RN FROM Hour_4684807221950341358
    where DataTime BETWEEN '2019-06-03 00:00:00' and '2019-06-04 23:00:00'
    ) AS A WHERE RN=1

    UNION ALL
    --沉降监测2
    SELECT * FROM
    (SELECT *,ROW_NUMBER() OVER (PARTITION BY CONVERT(VARCHAR(10),DataTime,23),HFCodeID ORDER BY DataTime DESC) AS RN FROM Hour_4964749819094058863
    where DataTime BETWEEN '2019-06-03 00:00:00' and '2019-06-04 23:00:00'
    ) AS A WHERE RN=1
    UNION ALL
    --渗压监测
    SELECT * FROM
    (SELECT *,ROW_NUMBER() OVER (PARTITION BY CONVERT(VARCHAR(10),DataTime,23),HFCodeID ORDER BY DataTime DESC) AS RN FROM Hour_5157124432278248782
    where DataTime BETWEEN '2019-06-03 00:00:00' and '2019-06-04 23:00:00'
    ) AS A WHERE RN=1
    ) xx order by DataTime asc


    --沉降监测
    SELECT * FROM
    (SELECT *,ROW_NUMBER() OVER (PARTITION BY CONVERT(VARCHAR(10),DataTime,23),HFCodeID ORDER BY DataTime DESC) AS RN FROM Hour_4884202820057099879
    where DataTime BETWEEN '2019-06-04 00:00:00' and '2019-06-04 23:00:00'
    ) AS A WHERE RN=1
    UNION ALL
    --渗压监测
    SELECT * FROM
    (SELECT *,ROW_NUMBER() OVER (PARTITION BY CONVERT(VARCHAR(10),DataTime,23),HFCodeID ORDER BY DataTime DESC) AS RN FROM Hour_4909605008448672773
    where DataTime BETWEEN '2019-06-04 00:00:00' and '2019-06-04 23:00:00'
    ) AS A WHERE RN=1
    UNION ALL
    --倾斜监测
    SELECT * FROM
    (SELECT *,ROW_NUMBER() OVER (PARTITION BY CONVERT(VARCHAR(10),DataTime,23),HFCodeID ORDER BY DataTime DESC) AS RN FROM Hour_5030118834484935845
    where DataTime BETWEEN '2019-06-04 00:00:00' and '2019-06-04 23:00:00'
    ) AS A WHERE RN=1

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  • 原文地址:https://www.cnblogs.com/yelanggu/p/10968613.html
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