如何在 SQL 查询结果中动态添加行答案

【问题标题】：How to dynamically add row(s) in SQL query result如何在 SQL 查询结果中动态添加行
【发布时间】：2018-03-10 12:06:44
【问题描述】：

这个查询

SELECT T.TestTypeId, F.FlockCode, AMT, CV, S.SampleDate 
FROM [dbo].[Tests] AS T 
JOIN [Samples] AS S ON T.SampleId = S.Id 
JOIN [TestTypes] AS TT ON T.TestTypeId = TT.Id 
JOIN [Flocks] AS F ON T.FlockId = F.Id 
WHERE T.TestTypeId = 7 AND T.IsDeleted = 0 
AND S.SampleDate BETWEEN '2017-12-17' AND '2018-01-08' 
AND T.FlockId IN (7,13)
ORDER BY S.SampleDate, F.FlockCode

返回以下结果

TestTypeId  FlockCode   AMT     CV      SampleDate
7           R1.33       8.93    9.28    2017-12-17
7           R1.33       9.05    10.76   2018-01-01
7           R1.37       8.95    8.99    2018-01-01

这对于现有数据是准确的，其中S.SampleDate 2017-12-17 只有一行FlockCode R1.33。

现在我需要在此结果中为 0 或 0 或 AMT 和 CV 值的数据 2017-12-17 上的 FlockCode R1.37 添加另一行。

所以预期的结果是

TestTypeId  FlockCode   AMT     CV      SampleDate
7           R1.33       8.93    9.28    2017-12-17
7           R1.37       0       0       2017-12-17
7           R1.33       9.05    10.76   2018-01-01
7           R1.37       8.95    8.99    2018-01-01

SQL 或 LINQ 或 C# 中的任何解决方案都会非常有帮助。提前致谢。

【问题讨论】：

标签： c# sql sql-server linq

【解决方案1】：

基本结构是使用cross join 和left join 执行此操作。您的查询有点复杂，所以我建议：

with t as (
      SELECT T.TestTypeId, F.FlockCode, AMT, CV, S.SampleDate 
      FROM [dbo].[Tests] T JOIN
           [Samples] S
           ON T.SampleId = S.Id JOIN
           [TestTypes] TT
           ON T.TestTypeId = TT.Id  JOIN
           [Flocks] F
           ON T.FlockId = F.Id 
      WHERE T.TestTypeId = 7 AND T.IsDeleted = 0 AND
            S.SampleDate BETWEEN '2017-12-17' AND '2018-01-08' AND
            T.FlockId IN (7, 13)
     )
SELECT f.TestTypeId, f.FlockCode, COALESCE(t.AMT, 0) as AMT,
       COALESCE(t.CV, 0) as CV, d.SampleDate
FROM (SELECT DISTINCT TestTypeId, FlockCode FROM t) f CROSS JOIN
     (SELECT DISTINCT SampleDate FROM t) d LEFT JOIN
     t
     ON f.FlockCode = t.FlockCode AND f.TestTypeId = t.TestTypeId,
        d.SampleDate = t.SampleDate
ORDER BY d.SampleDate, f.FlockCode;

【讨论】：

啊，这就是我要找的答案

【解决方案2】：

就UNION吧！

SELECT T.TestTypeId, F.FlockCode, AMT, CV, S.SampleDate 
FROM [dbo].[Tests] AS T 
JOIN [Samples] AS S ON T.SampleId = S.Id 
JOIN [TestTypes] AS TT ON T.TestTypeId = TT.Id 
JOIN [Flocks] AS F ON T.FlockId = F.Id 
WHERE T.TestTypeId = 7 AND T.IsDeleted = 0 
AND S.SampleDate BETWEEN '2017-12-17' AND '2018-01-08' 
AND T.FlockId IN (7,13)
UNION
SELECT 7 AS TestTypeId, 'R1.37' as FlockCode, 0 as AMT, 0 as CV, '2017-12-17' as SampleDate
ORDER BY SampleDate, FlockCode

【讨论】：

感谢您的回答，这符合要求，但这里7 或R1.37 将动态更改。

【解决方案3】：

在SQL中你可以使用UNION操作符

SELECT T.TestTypeId, F.FlockCode, AMT, CV, S.SampleDate 
FROM [dbo].[Tests] AS T 
JOIN [Samples] AS S ON T.SampleId = S.Id 
JOIN [TestTypes] AS TT ON T.TestTypeId = TT.Id 
JOIN [Flocks] AS F ON T.FlockId = F.Id 
WHERE T.TestTypeId = 7 AND T.IsDeleted = 0 
AND S.SampleDate BETWEEN '2017-12-17' AND '2018-01-08' 
AND T.FlockId IN (7,13)
UNION 
SELECT 7 AS TestTypeId, 'R1.37' AS FlockCode, 0 AS AMT, 0 AS CV, '2017-12-17' AS SampleDate
ORDER BY SampleDate, FlockCode

【讨论】：

感谢您的回答，这符合要求，但这里7 或R1.37 将动态更改。