在SQL (PostgreSQL)中,根据最接近日期值的其他字段的唯一组合对字段求和,可以通过以下步骤实现:
SELECT *
FROM your_table
ORDER BY date_column;
SELECT *,
date_column - LAG(date_column) OVER (ORDER BY date_column) AS date_diff
FROM your_table
ORDER BY date_column;
SELECT *,
ROW_NUMBER() OVER (ORDER BY date_column) AS row_num,
date_column - LAG(date_column) OVER (ORDER BY date_column) AS date_diff
FROM your_table
ORDER BY date_column;
SELECT *,
ROW_NUMBER() OVER (PARTITION BY row_num ORDER BY date_diff) AS diff_row_num,
date_column - LAG(date_column) OVER (ORDER BY date_column) AS date_diff
FROM (
SELECT *,
ROW_NUMBER() OVER (ORDER BY date_column) AS row_num,
date_column - LAG(date_column) OVER (ORDER BY date_column) AS date_diff
FROM your_table
ORDER BY date_column
) subquery;
SELECT SUM(your_field) AS sum_field
FROM (
SELECT *,
ROW_NUMBER() OVER (PARTITION BY row_num ORDER BY date_diff) AS diff_row_num,
date_column - LAG(date_column) OVER (ORDER BY date_column) AS date_diff
FROM (
SELECT *,
ROW_NUMBER() OVER (ORDER BY date_column) AS row_num,
date_column - LAG(date_column) OVER (ORDER BY date_column) AS date_diff
FROM your_table
ORDER BY date_column
) subquery
) subquery2
WHERE diff_row_num = 1;
这样,你就可以根据最接近日期值的其他字段的唯一组合对字段进行求和操作了。
请注意,以上示例中的your_table、date_column和your_field是需要根据实际情况替换的表名、日期字段和需要求和的字段名。另外,这只是一种实现方式,具体的实现方法可能因数据结构和需求而有所不同。
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