mysql - 在 MySQL 中创建渐进求和列

Question

我需要使用mysql显示progressive_total。

我有一个如下所示的表格:

id    value                    cumulative_total
 1    100                            100
 2    150                            250
 3    200                            450 
 4    300                            750

我想添加一个名为progressive_total的新列，因此表格将如下所示:

id    value          Progressive_total          cumulative_total
 1    100                 -                          100
 2    150                100                         250
 3    200                250                         450 
 4    300                450                         750

我使用下面的 mysql 查询来显示累计总数:

SELECT t.id, t.value,
  (SELECT SUM(x.value) FROM house_details x WHERE x.id <= t.id) AS cumulative_total
FROM house_details t
WHERE t.income IS NOT NULL AND t.income!= '' AND YEAR(t.cdate) = YEAR(CURRENT_DATE())
ORDER BY t.id

上面的查询工作正常并获取cumulative_total。但我也想显示progressive_total，就像我在示例中给出的那样。

Answer 1

SELECT t.id, t.value,
  IFNULL((SELECT SUM(x.value) FROM house_details x WHERE x.id < t.id), '-') AS progressive_total,
  (SELECT SUM(x.value) FROM house_details x WHERE x.id <= t.id) AS cumulative_total
FROM house_details t
WHERE t.income IS NOT NULL AND t.income!= '' AND YEAR(t.cdate) = YEAR(CURRENT_DATE())
ORDER BY t.id