如何将SQL中每季度每小时值的下一行扩展/填充为每小时值(MSSQL)

在MSSQL中，要将SQL中每季度每小时值的下一行扩展/填充为每小时值，可以使用窗口函数和日期函数来实现。具体步骤如下：

首先，使用窗口函数和日期函数生成一个包含每季度每小时值的临时表或子查询。假设原始数据表为table1，其中包含字段datetime（时间）和value（值）。

WITH cte AS (
  SELECT 
    DATEPART(QUARTER, datetime) AS quarter,
    DATEPART(HOUR, datetime) AS hour,
    value,
    ROW_NUMBER() OVER (PARTITION BY DATEPART(QUARTER, datetime), DATEPART(HOUR, datetime) ORDER BY datetime) AS rn
  FROM table1
)
SELECT 
  quarter,
  hour,
  value
FROM cte
WHERE rn = 1

上述查询会生成一个包含每季度每小时的第一条记录的临时表或子查询。

接下来，使用LAG函数获取每季度每小时的下一行数据，并计算出相差的小时数。

WITH cte AS (
  SELECT 
    DATEPART(QUARTER, datetime) AS quarter,
    DATEPART(HOUR, datetime) AS hour,
    value,
    LAG(value) OVER (PARTITION BY DATEPART(QUARTER, datetime), DATEPART(HOUR, datetime) ORDER BY datetime) AS prev_value,
    DATEDIFF(HOUR, LAG(datetime) OVER (PARTITION BY DATEPART(QUARTER, datetime), DATEPART(HOUR, datetime) ORDER BY datetime), datetime) AS hour_diff
  FROM table1
)
SELECT 
  quarter,
  hour,
  prev_value AS value
FROM cte
WHERE hour_diff = 1

上述查询会生成一个包含每季度每小时值的下一行数据的临时表或子查询。

最后，将步骤1和步骤2生成的临时表或子查询进行UNION操作，以获取每季度每小时值的完整列表。

WITH cte1 AS (
  SELECT 
    DATEPART(QUARTER, datetime) AS quarter,
    DATEPART(HOUR, datetime) AS hour,
    value,
    ROW_NUMBER() OVER (PARTITION BY DATEPART(QUARTER, datetime), DATEPART(HOUR, datetime) ORDER BY datetime) AS rn
  FROM table1
),
cte2 AS (
  SELECT 
    DATEPART(QUARTER, datetime) AS quarter,
    DATEPART(HOUR, datetime) AS hour,
    value,
    LAG(value) OVER (PARTITION BY DATEPART(QUARTER, datetime), DATEPART(HOUR, datetime) ORDER BY datetime) AS prev_value,
    DATEDIFF(HOUR, LAG(datetime) OVER (PARTITION BY DATEPART(QUARTER, datetime), DATEPART(HOUR, datetime) ORDER BY datetime), datetime) AS hour_diff
  FROM table1
)
SELECT 
  quarter,
  hour,
  value
FROM cte1
WHERE rn = 1
UNION
SELECT 
  quarter,
  hour,
  prev_value AS value
FROM cte2
WHERE hour_diff = 1

通过以上步骤，你可以将SQL中每季度每小时值的下一行扩展/填充为每小时值。这样得到的结果表将包含每个季度每个小时的值。

请注意，这只是一种实现方法，具体的查询语句可能需要根据实际情况进行调整。同时，关于SQL的具体用法和语法请参考相关文档或教程。

补充：若您在使用腾讯云的数据库产品，推荐使用腾讯云的云数据库SQL Server版（TDSQL）作为MSSQL的云解决方案。TDSQL提供了全面的功能，包括高可用、自动备份、弹性扩缩容等特性，适用于各类应用场景。详情请参考腾讯云数据库SQL Server版（TDSQL）产品介绍：TDSQL产品介绍

如何将SQL中每季度每小时值的下一行扩展/填充为每小时值(MSSQL)

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