具有多个字段的 SSMS Case 语句

Question

我有一个用于求和、舍入和标记金额的 case 语句，效果很好，但数据最终以水平格式结束（每条记录有多个金额），导致我在后续语句中进行逆透视以格式化垂直数据（每条记录一个金额）。如果可能的话，我想在一个声明中完成这个。我的代码如下：

SELECT
    Field,
    ROUND(SUM(CASE
                  WHEN TYPE = 'Paid Loss'
                  THEN AMOUNT
                  ELSE 0
              END
          ), 2
    ) PAID,
    ROUND(SUM(CASE
                  WHEN TYPE = 'OS'
                  THEN AMOUNT
                  ELSE 0
              END
          ), 2
    ) OS,
    ROUND(SUM(CASE
                  WHEN TYPE <> 'Paid Exp'
                  THEN AMOUNT
                  ELSE 0
              END
          ), 2
    ) INCURRED
FROM dbo.mydatabase
GROUP BY Field;

结果是：

Field   |PAID |OS  |INCURRED
----------------------------
result1 | 1   | 20 | 10
result2 | 5   | 30 | 15

当我真正想要的是：

Field   | DATA_TYPE | AMOUNT
---------------------------
result1 | PAID      | 1
result2 | PAID      | 5
result3 | OS        | 20
result4 | OS        | 30
result5 | INCURRED  | 10
result6 | INCURRED  | 15

密钥将是唯一的，所以这不是问题。任何人都知道如何重新排列 CASE 以便可以在一条语句中完成？谢谢！

Answer 1

这不行吗？

SELECT Field, 'PAID' DATA_TYPE, ROUND(SUM(AMOUNT), 2) AMOUNT
FROM dbo.mydatabase
WHERE TYPE = 'Paid Loss'
GROUP BY Field

UNION ALL

SELECT Field, 'OS' DATA_TYPE, ROUND(SUM(AMOUNT), 2) AMOUNT
FROM dbo.mydatabase
WHERE TYPE = 'OS'
GROUP BY Field

UNION ALL

SELECT Field, 'INCURRED' DATA_TYPE, ROUND(SUM(AMOUNT), 2) AMOUNT
FROM dbo.mydatabase
WHERE TYPE <> 'Paid Exp'
GROUP BY Field

甚至像这样：

SELECT Field
  , (CASE
     WHEN TYPE IN ('Paid Loss', 'OS') THEN TYPE
     WHEN TYPE <> 'Paid Exp' THEN 'INCURRED'
     END) DATA_TYPE
  , ROUND(SUM(AMOUNT), 2) AMOUNT
FROM dbo.mydatabase
GROUP BY Field
  , (CASE
     WHEN TYPE IN ('Paid Loss', 'OS') THEN TYPE
     WHEN TYPE <> 'Paid Exp' THEN 'INCURRED'
     END) DATA_TYPE

具有多个字段的 SSMS Case 语句

SSMS Case Statement With Multiple Fields

case

sql-server-2014

unpivot