如何在SQL查询结果中动态添加行

Question

this query

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

returns the following result

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

which is accurate for the existing data, where for S.SampleDate 2017-12-17 there is only one row for FlockCode R1.33.

Now I need, to add another row in this result for the FlockCode R1.37 on the data 2017-12-17 with 0 or null AMT & CV value.

So the expected result would be

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

Any solution in either SQL or LINQ or C# will be very helpful. Thanks in advance.

Answer 1

The basic structure is to do this with a cross join and left join . Your query is a bit complicated, so I would suggest:

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;

Answer 2

In SQL you could use UNION operator

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

Answer 3

Just UNION it!

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