Question

我有一个带有列的SQL Server表：

ID, START_DTTM, OPEN, HIGH, LOW, CLOSE

我必须每小时汇总数据。

所以，我尝试了这个查询：

SELECT
    ID,
    MIN(START_DTTM) START_DTTM,
    MAX(HIGH) AS HIGH,
    MIN(LOW) AS LOW
FROM 
    MY_TABLE
GROUP BY 
    ID, DATEPART(DAY, START_DTTM), DATEPART(HOUR, START_DTTM)

它有效，但我无法拉开和关闭。

我试过这样的事情：

FIRST_VALUE(OPEN_PRICE) OVER (PARTITION BY 
DATEPART(DAY, START_DTTM), DATEPART(HOUR, START_DTTM) ORDER BY START_DTTM)

当然，它不起作用。我该怎么办？

Answer 1

您可以使用子查询：

SELECT ID, MIN(START_DTTM) START_DTTM, MAX(HIGH) AS HIGH, MIN(LOW) AS LOW,
       MAX(CASE WHEN seqnum_asc = 1 THEN OPEN_PRICE END) as open_price,
       MAX(CASE WHEN seqnum_desc = 1 THEN CLOSE_PRICE END) as close_price
FROM (SELECT t.*,
             ROW_NUMBER() OVER (PARTITION BY ID, DATEPART(DAY, START_DTTM), DATEPART(HOUR, START_DTTM) ORDER BY STRT_DTTM) as seqnum_asc,
             ROW_NUMBER() OVER (PARTITION BY ID, DATEPART(DAY, START_DTTM), DATEPART(HOUR, START_DTTM) ORDER BY STRT_DTTM) as seqnum_desc
      FROM MY_TABLE
     ) t
GROUP BY ID, DATEPART(DAY, START_DTTM), DATEPART(HOUR, START_DTTM);

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