I´m trying to build a query using a subquery in my WHERE condition, and when the subquery table is empty, I actually want to apply no filters to my query, and get all entries.
How can I achieve what I want?
This is my query:
SELECT
m.Material,
p.Plant
FROM dbo.AllPlants AS p
JOIN dbo.AllMaterials AS m
ON p.MaterialID = m.MaterialID
WHERE p.Plant IN ( SELECT Plant FROM dbo.MyFavoritePlants);
If I have no Favorite Plants, I want All Plants!
You could add second condition to handle that scenario:
SELECT
m.Material,
p.Plant
FROM dbo.AllPlants AS p
JOIN dbo.AllMaterials AS m
ON p.MaterialID = m.MaterialID
WHERE p.Plant IN (SELECT Plant FROM dbo.MyFavoritePlants)
OR NOT EXISTS (SELECT 1 FROM dbo.MyFavoritePlants)
Instead of sub query, you can use LEFT JOIN. So if there is no entry from MyFavoritePlants table, it will ignore the LEFT JOIN condition.
SELECT m.Material,
p.Plant
FROM dbo.AllPlants AS p
JOIN dbo.AllMaterials AS m ON p.MaterialID = m.MaterialID
LEFT JOIN dbo.MyFavoritePlants FP ON FP.Plant = p.Plant
I don't have enough reputation yet to comment but this might work
SELECT
m.Material,
p.Plant
FROM dbo.AllPlants AS p
JOIN dbo.AllMaterials AS m ON p.MaterialID = m.MaterialID
LEFT JOIN dbo.MyFavoritePlants FP ON FP.Plant = P.Plant
Related
We have many complex queries which involve a lot of columns and joins (see the example below) that are implemented as views.
In some cases these queries return duplicate rows which then have to be programmatically removed by the consuming app. Therefore, we would like to enhance the SQL query to eliminate the duplicates, and speed up the retrieval process.
I know that I can use OVER / PARTITION BY logic to do this, but I am not sure of how to modify the queries to obtain a working syntax.
Here is an example:
SELECT
Main.MfgOrder.OrderNumber,
Main.MfgOrder.DesignBOMID,
Main.Design_Plant.PlantID,
Main.MfgOrder_Operation.OrderOpID,
Main.MfgOrder_Operation.DesignOpID,
Main.MfgOrder_Operation.OpSeq,
Main.MfgOrder_Operation.Description,
Main.MfgOrder_Operation.CompletionStatus,
Main.MfgOrder__Shift.OrderShiftID,
Main.MfgOrder__Shift.WorkCenterMachineID,
Main.MfgOrder___Event.OrderEventID,
Main.MfgOrder____Reel.OrderReelID,
Main.MfgOrder____Reel.ReelNumber,
Main.MfgOrder____Reel.Location,
Main.MfgOrder____Reel.Test_Status AS Test_Status_Reel,
Main.MfgOrder____Reel.Test_Disposition AS Test_Disposition_Reel,
Main.MfgOrder____Reel.LabReleased,
Main.MfgOrder____Reel.ShipReelsBypassSet,
Main.MfgOrder_____Length.OrderLengthID,
Main.MfgOrder_____Length.LengthType,
Main.MfgOrder_____Length.LocationOnReel,
Main.MfgOrder_____Length.LocationOnLength,
Main.MfgOrder_____Length.TrialNumber,
Main.MfgOrder_____Length.SampleNumber,
Main.MfgOrder_____Length.PrintNumber,
Main.MfgOrder_____Length.Test_Status AS Test_Status_Length,
Main.MfgOrder_____Length.Test_Category,
Main.MfgOrder_____Length.Test_Disposition AS Test_Disposition_Length,
Main.MfgOrder_____Length.SampleSubmittedBy,
Main.MfgOrder_____Length.SampleSubmittedDate,
Main.MfgOrder_____Length.BypassTesting,
Main.MfgOrder_____Length_OperatorQty.Sample1Destination,
Main.MfgOrder_____Length_OperatorQty.Sample2Destination,
Main.MfgOrder_____Length_OperatorQty.Sample3Destination,
Main.MfgOrder______Component.OrderComponentID,
Main.MfgOrder______Component.DesignComponentID,
Main.MfgOrder______Component.ItemNo,
Main.MfgOrder_______Test.LabTestID,
Main.MfgOrder_______Test.OrderTestID,
Main.MfgOrder_______Test.TestComplete,
Main.MfgOrder_______Test.TestStatus,
Main.MfgOrder________Marker2.OrderMarkerID,
Master.Color.ColorName,
Master.LabTest.ExcludeFromPassFail,
CASE
WHEN Main.Design_Component.Component_Label IS NULL
THEN 'Unknown'
ELSE Main.Design_Component.Component_Label
END AS Component_Label
FROM
Main.MfgOrder
INNER JOIN
Main.Design__BOM ON Main.MfgOrder.DesignBOMID = Main.Design__BOM.DesignBOMID
INNER JOIN
Main.Design_Plant ON Main.Design__BOM.DesignPlantID = Main.Design_Plant.DesignPlantID
INNER JOIN
Main.MfgOrder_Operation ON Main.MfgOrder.OrderNumber = Main.MfgOrder_Operation.OrderNumber
INNER JOIN
Main.MfgOrder__Shift ON Main.MfgOrder_Operation.OrderOpID = Main.MfgOrder__Shift.OrderOpID
INNER JOIN
Main.MfgOrder___Event ON Main.MfgOrder__Shift.OrderShiftID = Main.MfgOrder___Event.OrderShiftID
INNER JOIN
Main.MfgOrder____Reel ON Main.MfgOrder___Event.OrderEventID = Main.MfgOrder____Reel.OrderEventID
INNER JOIN
Main.MfgOrder_____Length ON Main.MfgOrder____Reel.OrderReelID = Main.MfgOrder_____Length.OrderReelID
LEFT OUTER JOIN
Main.MfgOrder______Component ON Main.MfgOrder_____Length.OrderLengthID = Main.MfgOrder______Component.OrderLengthID
LEFT OUTER JOIN
Main.MfgOrder_______Test ON Main.MfgOrder______Component.OrderComponentID = Main.MfgOrder_______Test.OrderComponentID
LEFT OUTER JOIN
Main.MfgOrder________Marker2 ON Main.MfgOrder_______Test.OrderTestID = Main.MfgOrder________Marker2.OrderTestID
LEFT OUTER JOIN
Main.Design_Component ON Main.MfgOrder______Component.DesignComponentID = Main.Design_Component.DesignComponentID
LEFT OUTER JOIN
Master.Color ON Main.MfgOrder______Component.TapeColorID = Master.Color.ColorNumber
LEFT OUTER JOIN
Master.LabTest ON Main.MfgOrder_______Test.LabTestID = Master.LabTest.LabTestID
LEFT OUTER JOIN
Main.MfgOrder_____Length_OperatorQty ON Main.MfgOrder______Component.OrderLengthID = Main.MfgOrder_____Length_OperatorQty.OrderLengthID
you can use row_number as below: Below query will not select duplicate only on OrderNumber, if you need to add other columns you add accordingly
Select * from (
Select
RowN = Row_Number() over( partition by Main.MfgOrder.OrderNumber order by Main.MfgOrder.OrderNumber),
--- All your select columns and all your query with joins
) a
Where a.RowN = 1
Is the entire row duplicated exactly? If so then just add DISTINCT
SELECT DISTINCT
...
FROM
...
If you are getting duplicate rows where most columns the same but some columns are different then GROUP BY the columns that are the same and select MIN(column_name) for the ones that are causing the extra rows to appear.
I am new to SQL.Is this a correct join for multiple tables.
select * from [dbo].[Quotes] Q ,[dbo].[Invoices] I ,[dbo].[Receipts] R ,
[dbo].[QuoteLines] QL where QL.QuoteID = Q.ID AND I.QuoteID = Q.ID
AND R.QuoteID = Q.ID AND QL.Amount = 336.47 and QL.TravelType = 'International' and QL.Type = 'Accommodation'
Your question
Is this a correct join for multiple tables
Should be answered with No... It might work as expected, but this way of joining is outdated for centuries.
Your approach names all tables comma separated. This would lead to a huge cartesian product, a combination of each row with each row. The following WHERE clause makes sure, that you will get the needed/related rows and columns only...
Not knowing your structure this is a blind flight, but I think you are looking for something like this:
select *
from [dbo].[Quotes] Q
inner join [dbo].[QuoteLines] QL on Q.ID=QL.QuoteID
inner join [dbo].[Invoices] I on I.QuoteID=Q.ID
inner join [dbo].[Receipts] R on R.QuoteID=Q.ID
where QL.Amount = 336.47
and QL.TravelType = 'International'
and QL.[Type] = 'Accommodation';
You might want to change inner to left in cases, where not each row has a corresponding row on the other side.
Try this:-
Select table1.ID ,table1.Name
from Table1
inner join Table2 on Table1 .ID =Table2 .ID
inner join Table3 on table2.ID=Table3 .ID
where table1.Name = Table3.Name
How to use this below query as join instead of subquery. It's resulting poor performance
SELECT EBIJ.* FROM BUDLINEITEMS EBIJ
WHERE ReferenceId NOT IN (SELECT ImportKeyId FROM External_Blk_Itm_JounalEntries)
SELECT EBIJ.*
FROM BUDLINEITEMS EBIJ
LEFT JOIN External_Blk_Itm_JounalEntries E
ON EBIJ.ReferenceId = E.ImportKeyId
WHERE E.ImportKeyId IS NULL
OR
SELECT EBIJ.* FROM BUDLINEITEMS EBIJ
WHERE NOT EXISTS (SELECT 1
FROM External_Blk_Itm_JounalEntries E
WHERE EBIJ.ReferenceId = E.ImportKeyId )
I have a complex query to retrieve some results:
EDITED QUERY (added the UNION ALL):
SELECT t.*
FROM (
SELECT
dbo.Intervencao.INT_Processo, analista,
ETS.ETS_Sigla, ATC.ATC_Sigla, PAT.PAT_Sigla, dbo.Assunto.SNT_Peso,
CASE
WHEN ETS.ETS_Sigla = 'PE' AND (PAT.PAT_Sigla = 'LIB' OR PAT.PAT_Sigla = 'LBR') THEN (0.3*SNT_Peso)
WHEN ETS.ETS_Sigla = 'CD' THEN (0.3*SNT_Peso)*0.3
ELSE SNT_Peso
END AS PESOAREA,
CASE
WHEN a.max_TEA_FimTarefa IS NULL THEN a.max_TEA_InicioTarefa
ELSE a.max_TEA_FimTarefa
END AS DATA_INICIO_TERMINO,
ROW_NUMBER() OVER (PARTITION BY ATC.ATC_Sigla, a.SRV_Id ORDER BY TEA_FimTarefa DESC) AS seqnum
FROM dbo.Tarefa AS t
INNER JOIN (
SELECT
MAX(dbo.TarefaEtapaAreaTecnica.TEA_InicioTarefa) AS max_TEA_InicioTarefa,
MAX (dbo.TarefaEtapaAreaTecnica.TEA_FimTarefa) AS max_TEA_FimTarefa,
dbo.Pessoa.PFJ_Descri AS analista, dbo.AreaTecnica.ATC_Id, dbo.Tarefa.SRV_Id
FROM dbo.TarefaEtapaAreaTecnica
LEFT JOIN dbo.Tarefa ON dbo.TarefaEtapaAreaTecnica.TRF_Id = dbo.Tarefa.TRF_Id
LEFT JOIN dbo.AreaTecnica ON dbo.TarefaEtapaAreaTecnica.ATC_Id = dbo.AreaTecnica.ATC_Id
LEFT JOIN dbo.ServicoAreaTecnica ON dbo.TarefaEtapaAreaTecnica.ATC_Id = dbo.ServicoAreaTecnica.ATC_Id
AND dbo.Tarefa.SRV_Id = dbo.ServicoAreaTecnica.SRV_Id
INNER JOIN dbo.Pessoa ON dbo.Pessoa.PFJ_Id = dbo.ServicoAreaTecnica.PFJ_Id_Analista
GROUP BY dbo.AreaTecnica.ATC_Id, dbo.Tarefa.SRV_Id, dbo.Pessoa.PFJ_Descri
) AS a ON t.SRV_Id = a.SRV_Id
INNER JOIN dbo.TarefaEtapaAreaTecnica AS TarefaEtapaAreaTecnica_1 ON
t.TRF_Id = TarefaEtapaAreaTecnica_1.TRF_Id
AND a.ATC_Id = TarefaEtapaAreaTecnica_1.ATC_Id
AND a.max_TEA_InicioTarefa = TarefaEtapaAreaTecnica_1.TEA_InicioTarefa
LEFT JOIN AreaTecnica ATC ON TarefaEtapaAreaTecnica_1.ATC_Id = ATC.ATC_Id
LEFT JOIN Etapa ETS ON TarefaEtapaAreaTecnica_1.ETS_Id = ETS.ETS_Id
LEFT JOIN ParecerTipo PAT ON TarefaEtapaAreaTecnica_1.PAT_Id = PAT.PAT_Id
LEFT OUTER JOIN dbo.Servico ON a.SRV_Id = dbo.Servico.SRV_Id
INNER JOIN dbo.Intervencao ON dbo.Servico.INT_Id = dbo.Intervencao.INT_Id
LEFT JOIN dbo.Assunto ON dbo.Servico.SNT_Id = dbo.Assunto.SNT_Id
) t
The result is following:
It works good, the problem is that I was asked that if when a row is not present on this query, it must contain values from another table (ServicoAreaTecnica), so I got this query for the other table based on crucial information of the first query. So if I UNION ALL I get this:
Query1 +
UNION ALL
SELECT INN.INT_Processo,
PES.PFJ_Descri,
NULL, --ETS.ETS_Sigla,
ART.ATC_Sigla,
NULL ,--PAT.PAT_Sigla,
ASS.SNT_Peso,
NULL, --PESOAREA
NULL, --DATA_INICIO_TERMINO
NULL --seqnum
FROM dbo.ServicoAreaTecnica AS SAT
INNER JOIN dbo.AreaTecnica AS ART ON ART.ATC_Id = SAT.ATC_Id
INNER JOIN dbo.Servico AS SER ON SER.SRV_Id = SAT.SRV_Id
INNER JOIN dbo.Assunto AS ASS ON ASS.SNT_Id = SER.SNT_Id
INNER JOIN dbo.Intervencao AS INN ON INN.INT_Id = SER.INT_Id
INNER JOIN dbo.Pessoa AS PES ON PES.PFJ_Id = SAT.PFJ_Id_Analista
The result is following:
So what I want to do is to remove row number 1 because row number 2 exists on the first query, I think I got it explained better this time. The result should be only row number 1, row number 2 would appear only if query 1 doesn't retrieve a row for that particular INN.INT_Processo.
Thanks!
Ok, there are two ways to reduce your record set. Given that you've already written the code to produce the table with the extra rows, it might be easiest to just add code to reduce that:
Select * from
(Select *
, Row_Number() over
(partition by IntProcesso, Analista order by ISNULL(seqnum, 0) desc) as RN
from MyResults) a
where RN = 1
This will assign row_number 1 to any rows that came from your first query, or to any rows from the second query that do not have matches in the first query, then filter out extra rows.
You could also use outer joins with isnull or coalesce, as others have suggested. Something like this:
Select ISNULL(a.IntProcesso, b.IntProcesso) as IntProcesso
, ISNULL(a.Analista, b.Analista) as Analista
, ISNULL(a.ETSsigla, b.ETSsigla) as ETSsigla
[repeat for the rest of your columns]
from Table1 a
full outer join Table2 b
on a.IntProcesso = b.IntProcesso and a.Analista = b.Analista
Your code is hard to read, because of the lengthy names of everything (and to be honest, the fact that they're in a language I don't speak also makes it a lot harder).
But how about: replacing your INNER JOINs with LEFT JOINs, adding more LEFT JOINs to draw in the alternative tables, and introducing ISNULL clauses for each variable you want in the results?
If you do something like ... Query1 Right Join Query2 On ... that should get only the rows in Query2 that don't appear in Query 1.
I have a query that is working for the most part until I had to add the inner select for "Trainers".
As you can see in the code below, I am trying to get all of the trainers for each of the segment ID's.
I am getting an error on the first inner selects where clause WHERE trn.segmentID = tes.teSegmentID saying that tes.teSegmentID is not defined.
Is there another way to approach this query in order to get the trainers like I am trying to accomplish?
SELECT *,
(SELECT e2.[FirstName] AS trainerFirst,
e2.[LastName] AS trainerLast
FROM BS_Training_Trainers AS trn
LEFT OUTER JOIN
employeeTable AS e2
ON trn.trainerEmpID = e2.EmpID
WHERE trn.segmentID = tes.teSegmentID
FOR XML PATH ('trainer'), TYPE, ELEMENTS, ROOT ('trainers'))
FROM dbo.BS_TrainingEvents AS a
WHERE a.trainingEventID IN (SELECT tes.trainingEventID
FROM dbo.BS_TrainingEvent_Segments AS tes
INNER JOIN
dbo.BS_TrainingEvent_SegmentDetails AS tesd
ON tesd.segmentID = tes.teSegmentID
INNER JOIN
dbo.BS_LocaleCodes AS locale
ON locale.localeID = tesd.localeID
WHERE locale.location = 'Baltimore');
It seems like you're taking the scenic route towards this:
SELECT a.*,
X.[FirstName],
X.[LastName]
FROM dbo.BS_TrainingEvents AS a
LEFT OUTER JOIN (SELECT e2.[FirstName], e2.[LastName], locale.location FROM dbo.BS_TrainingEvent_Segments AS tes
INNER JOIN dbo.BS_Training_Trainers AS trn ON trn.segmentID = tes.teSegmentID
INNER JOIN dbo.BS_TrainingEvent_SegmentDetails AS tesd ON tesd.segmentID = tes.teSegmentID
INNER JOIN dbo.BS_LocaleCodes AS locale ON locale.localeID = tesd.localeID
LEFT OUTER JOIN employeeTable AS e2 ON trn.trainerEmpID = e2.EmpID) AS X ON a.trainingEventID = X.trainingEventID
WHERE X.location = 'Baltimore';
Not sure if I got all those joins right, it was hard to decode from all the nesting you have going on.
If I have guessed table relationships from their names correctly, the only way to solve this is to reference the same filtering condition twice: first, in the XML generation part, and second in the outer level of the query:
with cte as (
select distinct tes.trainingEventID, tes.teSegmentID
from dbo.BS_TrainingEvent_Segments AS tes
INNER JOIN dbo.BS_TrainingEvent_SegmentDetails AS tesd ON tesd.segmentID = tes.teSegmentID
INNER JOIN dbo.BS_LocaleCodes AS locale ON locale.localeID = tesd.localeID
WHERE locale.location = 'Baltimore'
)
SELECT a.*, (
SELECT e2.[FirstName] AS trainerFirst, e2.[LastName] AS trainerLast
FROM BS_Training_Trainers AS trn
LEFT OUTER JOIN employeeTable AS e2 ON trn.trainerEmpID = e2.EmpID
inner join cte c on trn.segmentID = c.teSegmentID
FOR XML PATH ('trainer'), TYPE, ELEMENTS, ROOT ('trainers')
)
FROM dbo.BS_TrainingEvents AS a
where exists (select 0 from cte c where c.testrainingEventID = a.trainingEventID);
It's difficult to tell whether this is completely correct, of course, but I hope you get the idea.
Oh yes, and if you would have an event with multiple Baltimore segments, you will never be able to tell which trainer takes which one. But you can always add more data into XML to resolve this.