Sql server 2008 r2 将SQL Server数据从多个日期列格式化为单个日期列

我在数据库中有一些关于不同客户付款的数据。客户支付的款项中，很少有是通过的，也很少没有失败。SQL Server 2008 R2中的示例数据如下所示：

+-----------+------------+-------------+--------+--------+
|   Name    | Inst Date  | Status Date | Status | Amount |
+-----------+------------+-------------+--------+--------+
| Jonathan  | 2014-12-03 | 2014-12-05  | PASS   |  25000 |
| Samantha  | 2014-12-08 | 2014-12-11  | FAIL   | 105000 |
| David     | 2014-12-11 | 2014-12-11  | PASS   |   2500 |
| Samantha  | 2014-12-11 | 2014-12-15  | PASS   |  50000 |
| Jonathan  | 2014-12-15 | 2014-12-05  | PROC   |   5000 |
+-----------+------------+-------------+--------+--------+
                                                  187500

管理层希望此数据的格式如下所示

+-----------+------------+---------+--------+--------+
|   Name    |    Date    |   ALL   |  PASS  |  FAIL  |
+-----------+------------+---------+--------+--------+
| Jonathan  | 2014-12-03 |   25000 |      0 |      0 |
| Jonathan  | 2014-12-05 |       0 |  25000 |      0 |
| Samantha  | 2014-12-08 |  105000 |      0 |      0 |
| Samantha  | 2014-12-11 |       0 |      0 | 105000 |
| Samantha  | 2014-12-11 |   50000 |      0 |      0 |
| David     | 2014-12-11 |    2500 |   2500 |      0 |
| Samantha  | 2014-12-15 |       0 |  50000 |      0 |
| Jonathan  | 2014-12-15 |    5000 |      0 |      0 |
+-----------+------------+---------+--------+--------+
                            187500    77500   105000

使用嵌套游标，一个用于名称，另一个用于日期，通过从每个循环下的源表获取数据并从存储过程返回数据，我构建了一个临时表。所有这些都运转良好，但当一年的数据太多时，速度会非常缓慢

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有关于如何优化的建议吗？

您可以使用一个联合体进行优化

select name, [inst date] as date, amount as all, 0 as pass, 0 as fail
from payments
union
select name, [Status date] as date, 0 as all, case when Status = 'PASS' then amount else 0 end as pass, case when Status = 'FAIL' then amount else 0 end as fail
from payments

---

我不明白，为什么每个客户都有多条线路？为什么不这样做呢：

SELECT t.Name, t.Date, SUM(t.ALL) AS ALL, SUM(t.PASS) AS PASS, SUM(t.FAIL) AS FAIL
FROM
(
    SELECT 
        Name, 
        ,CASE WHEN Status IN ('PASS', 'FAIL') THEN [Inst Date] ELSE [Status Date] END AS Date
        -- OR SIMPLY one of the dates..
        ,Amount AS ALL
        ,CASE WHEN Status = 'PASS' THEN Amount ELSE 0 END AS PASS
        ,CASE WHEN Status = 'FAIL' THEN Amount ELSE 0 END AS FAIL
    FROM YourTable
) t
GROUP BY t.Name, t.Date

---

你需要一个GROUP BY after，否则David line将不起作用。例如Yes@MiguelRoxo，我添加了GROUP BY，效果很好。这同样有效，但我需要再次添加额外的GROUP BY，以避免每种类型出现单独的日期。