如何将单个查询中的多个总和从列旋转到行

Question

我已经搜索了所有答案数据库，但老实说还没有找到我需要的东西。我有一个包含合同价值的表格以及与每个价值相关的日期。我的查询应该总结过去 6 个月累积的合同价值，从当前日期开始并回顾 3 个月，始终考虑 6 个月的累积期：

SELECT
SUM((ContractDate > DATE_SUB(DATE_SUB(CURDATE(), INTERVAL 0 MONTH), INTERVAL 6 MONTH) AND (ContractCancelled <>1)) * ContractValue) AS Today, 
SUM((ContractDate > DATE_SUB(DATE_SUB(CURDATE(), INTERVAL 1 MONTH), INTERVAL 6 MONTH) AND (ContractDate <= DATE_SUB(CURDATE(), INTERVAL 1 MONTH)) AND (ContractCancelled <>1)) * ContractValue) AS OneMonthAgo,
SUM((ContractDate > DATE_SUB(DATE_SUB(CURDATE(), INTERVAL 2 MONTH), INTERVAL 6 MONTH) AND (ContractDate <= DATE_SUB(CURDATE(), INTERVAL 2 MONTH)) AND (ContractCancelled <>1)) * ContractValue) AS TwoMonthsAgo, 
SUM((ContractDate > DATE_SUB(DATE_SUB(CURDATE(), INTERVAL 3 MONTH), INTERVAL 6 MONTH) AND (ContractDate <= DATE_SUB(CURDATE(), INTERVAL 3 MONTH)) AND (ContractCancelled <>1)) * ContractValue) AS ThreeMonthsAgo 
FROM Contracts

查询工作正常，但我在一行中得到结果，每个累积值在不同的列中：

+----+---------+-------------+--------------+----------------+
|    | Today   | OneMonthAgo | TwoMonthsAgo | ThreeMonthsAgo | 
+--------------+-------------+--------------+----------------+
|  1 | 3434005 |   3992877   |    4104565   |     3688412    |
+--------------+-------------+--------------+----------------+

我需要将这个查询变成一个图表，并且要做到这一点，而不是列，累积的结果应该显示为行，或者像这样：

+---------------+--------------------------------------+
|  LookingTo    |  AcumulatedContractValue (6 months)  | 
+---------------+--------------------------------------+
|    Today      |              3434005                 |
+---------------+--------------------------------------+
| OneMonthAgo   |              3992877                 |
+---------------+--------------------------------------+
| TwoMonthsAgo  |              4104565                 |
+---------------+--------------------------------------+
|ThreeMonthsAgo |              3688412                 |
+---------------+--------------------------------------+

如果它是在 MS SQL 中，我相信 PIVOT 应该可以工作，但我不知道如何在 MySQL 中做到这一点。你能帮我解决这个问题吗？

Answer 1

我不明白你为什么需要它，但你可以联合：

SELECT 'Today' as `LookingTo`,
SUM((ContractDate > DATE_SUB(DATE_SUB(CURDATE(), INTERVAL 0 MONTH), INTERVAL 6 MONTH) AND (ContractCancelled <>1)) * ContractValue) as  Acumulated
FROM Contracts
UNION ALL
SELECT 'OneMonthAgo',
SUM((ContractDate > DATE_SUB(DATE_SUB(CURDATE(), INTERVAL 1 MONTH), INTERVAL 6 MONTH) AND (ContractDate <= DATE_SUB(CURDATE(), INTERVAL 1 MONTH)) AND (ContractCancelled <>1)) * ContractValue)
FROM Contracts
UNION ALL
SELECT 'TwoMonthsAgo',
SUM((ContractDate > DATE_SUB(DATE_SUB(CURDATE(), INTERVAL 2 MONTH), INTERVAL 6 MONTH) AND (ContractDate <= DATE_SUB(CURDATE(), INTERVAL 2 MONTH)) AND (ContractCancelled <>1)) * ContractValue)  
FROM Contracts
UNION ALL
SELECT 'ThreeMonthsAgo',
SUM((ContractDate > DATE_SUB(DATE_SUB(CURDATE(), INTERVAL 3 MONTH), INTERVAL 6 MONTH) AND (ContractDate <= DATE_SUB(CURDATE(), INTERVAL 3 MONTH)) AND (ContractCancelled <>1)) * ContractValue) 
FROM Contracts