添加和函数SQL Server 2012

我需要将不同列中的这些分钟加在一起，但当我尝试运行此语句时，我只看到空白。我已经尝试了很多东西，我认为它在where子句中。我将添加在4列以上一旦这是工作

SELECT [School Name],
   SUM(mins1)
   ,SUM(mins2) as mins2
  ,SUM(mins3) as mins3
   ,SUM(mins4) as mins4
   ,SUM(mins1+mins2+mins3+mins4) as Minutes
 FROM [dbo].[George].[TEST_TEMP_TABLE]
 WHERE serv1 IS NOT NULL 
AND serv1 = 'Speech Language Therapy'
AND serv2 IS NOT NULL 
AND serv2 = 'Speech Language Therapy'
AND serv3 = 'Speech Language Therapy'
AND serv3 IS NOT NULL 
AND serv4 = 'Speech Language Therapy'
AND serv4 IS NOT NULL 
GROUP BY [School Name]
ORDER BY [School Name]
 GO

---

在将记录包括在总和中之前，

WHERE

子句中的所有条件必须同时适用于每条记录

因为您看到的是一个空白的输出，所以看起来您没有任何记录，其中serv1、serv2、serv3和serv4都不同时为NULL

因为它看起来像要对每个MIN列进行求和，所以只有当相应的Serv列包含“语音语言治疗”时，考虑将此条件移到<代码>选择< /代码>查询的一部分，如下所示：

WITH CTE AS (
    SELECT [School Name],
       SUM(CASE WHEN serv1 = 'Speech Language Therapy' THEN mins1 ELSE 0 END) as mins1
      ,SUM(CASE WHEN serv2 = 'Speech Language Therapy' THEN mins2 ELSE 0 END) as mins2
      ,SUM(CASE WHEN serv3 = 'Speech Language Therapy' THEN mins3 ELSE 0 END) as mins3
      ,SUM(CASE WHEN serv4 = 'Speech Language Therapy' THEN mins4 ELSE 0 END) as mins4
    FROM [dbo].[George].[TEST_TEMP_TABLE]
    GROUP BY [School Name]
)
SELECT [School Name]
    , mins1, mins2, mins3, mins4
    , mins1 + mins2 + mins3 + mins4 as Minutes
FROM cte
ORDER BY [School Name]

SELECT [School Name],
   SUM(coalesce(mins1,0)) as mins1total,
   SUM(coalesce(mins2,0)) as mins2total,
   SUM(coalesce(mins3,0)) as mins3total,
   SUM(coalesce(mins4,0)) as mins4total,
   SUM(coalesce(min1,0) + coalesce(min2,0) + coalesce(min3,0) + coalesce(min4,0)) as alltotal
 FROM [dbo].[George].[TEST_TEMP_TABLE]
 WHERE 
   serv1 = 'Speech Language Therapy'
   AND serv2 = 'Speech Language Therapy'
   AND serv3 = 'Speech Language Therapy'
   AND serv4 = 'Speech Language Therapy'
GROUP BY [School Name]
ORDER BY [School Name]

在这里，我将mins1..mins4的计算移到了一个CTE中，以便于计算CTE之外所有4个的总和（避免再次重复每个CASE语句）

---

还请注意，如果您已经具备了

serv1='Speech Language Therapy'

的条件，则无需检查

serv1是否不为NULL，您可以重新编写SQL，使其类似于：

WITH CTE AS (
    SELECT [School Name],
       SUM(CASE WHEN serv1 = 'Speech Language Therapy' THEN mins1 ELSE 0 END) as mins1
      ,SUM(CASE WHEN serv2 = 'Speech Language Therapy' THEN mins2 ELSE 0 END) as mins2
      ,SUM(CASE WHEN serv3 = 'Speech Language Therapy' THEN mins3 ELSE 0 END) as mins3
      ,SUM(CASE WHEN serv4 = 'Speech Language Therapy' THEN mins4 ELSE 0 END) as mins4
    FROM [dbo].[George].[TEST_TEMP_TABLE]
    GROUP BY [School Name]
)
SELECT [School Name]
    , mins1, mins2, mins3, mins4
    , mins1 + mins2 + mins3 + mins4 as Minutes
FROM cte
ORDER BY [School Name]

SELECT [School Name],
   SUM(coalesce(mins1,0)) as mins1total,
   SUM(coalesce(mins2,0)) as mins2total,
   SUM(coalesce(mins3,0)) as mins3total,
   SUM(coalesce(mins4,0)) as mins4total,
   SUM(coalesce(min1,0) + coalesce(min2,0) + coalesce(min3,0) + coalesce(min4,0)) as alltotal
 FROM [dbo].[George].[TEST_TEMP_TABLE]
 WHERE 
   serv1 = 'Speech Language Therapy'
   AND serv2 = 'Speech Language Therapy'
   AND serv3 = 'Speech Language Therapy'
   AND serv4 = 'Speech Language Therapy'
GROUP BY [School Name]
ORDER BY [School Name]

执行
从test_temp_表中选择*，其中serv1='Speech…'和serv2='Speech…'以及serv3='Speech…'和serv4='Speech…'
并查看min1、min2、min3和min4列是否有数据。这里根本不清楚您要做什么。您是否意识到，检查给定字符串以及它是否也不为NULL是多余的。没有可以同时为NULL和“语音语言治疗”的字符串值。我有一种感觉，你想用或代替，但谁知道呢。