How do i merge two or more rows based on their foreign key?
I have three tables which are:
A(a1, a2, a3)
//This tbl (Table) can have multiple instances of a1, but cause of its dependence on b1,
//we have a unique re
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This is the query that merges two rows based on a foreign key (breaks the rule of 1NF).
DECLARE @StrengthID INT DECLARE @GenericDrugDetailsID INT DEClARE @DosageStrength INT DECLARE @PresentationUnitID INT DECLARE @DosageFormID INT DECLARE @RouteOfAdministrationID INT DECLARE @nCombinations INT DECLARE @maxCombinations INT DECLARE @CurrCombinationTotal INT DECLARE @CurrGenericDrugDetailsID INT DECLARE @PName VARCHAR(100) DECLARE @DName VARCHAR(100) DECLARE @DNameAbbrev VARCHAR(50) DECLARE @RName VARCHAR(100) DECLARE @GetGenericDrugStrengths CURSOR SET @nCombinations = 0 SET @CurrGenericDrugDetailsID = 0 --Get the maximum number of combinations --===================================================================================== SET @maxCombinations = (SELECT TOP 1 COUNT(GenericDrugDetailsID) AS maxCombinations FROM Pharmacy_Strengths GROUP BY GenericDrugDetailsID ORDER BY maxCombinations desc) --===================================================================================== --Create a temporary temp to hold the strengths --===================================================================================== DECLARE @tmpSQL VARCHAR(max) SET @tmpSQL = '' IF EXISTS (SELECT * FROM tempdb.sys.tables WHERE NAME LIKE '%tmpStrengths%') DROP TABLE #tmpStrengths CREATE TABLE #tmpStrengths ( StrengthID INT NOT NULL, GenericDrugDetailsID INT NOT NULL, NumberOfCombinations INT NOT NULL, DosageStrength1 INT NOT NULL, PresentationUnitID1 INT NOT NULL, PresentationUnitName1 VARCHAR(100) NOT NULL, DosageFormID1 INT NOT NULL, DosageFormName1 VARCHAR(100) NOT NULL, DosageFormNameAbbrev1 VARCHAR(50) NULL, RouteOfAdministrationID1 INT NOT NULL, RouteOfAdministrationName1 VARCHAR(100) NOT NULL); IF (@maxCombinations > 1) BEGIN DECLARE @counter int SET @counter = 1 WHILE @counter < @maxCombinations BEGIN SET @counter = @counter + 1 SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD StrengthID' + CAST(@counter AS VARCHAR(50)) + ' INT NULL;' SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD DosageStrength' + CAST(@counter AS VARCHAR(50)) + ' INT NULL;' SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD PresentationUnitID' + CAST(@counter AS VARCHAR(50)) + ' INT NULL; ' SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD PresentationUnitName' + CAST(@counter AS VARCHAR(100)) + ' VARCHAR(100) NULL; ' SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD DosageFormID' + CAST(@counter AS VARCHAR(50)) + ' INT NULL; ' SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD DosageFormName' + CAST(@counter AS VARCHAR(100)) + ' VARCHAR(100) NULL; ' SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD DosageFormNameAbbrev' + CAST(@counter AS VARCHAR(50)) + ' VARCHAR(50) NULL; ' SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD RouteOfAdministrationID' + CAST(@counter AS VARCHAR(50)) + ' INT NULL; ' SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD RouteOfAdministrationName' + CAST(@counter AS VARCHAR(100)) + ' VARCHAR(100) NULL; ' END END EXEC(@tmpSQL) --==================================================================================== SET @tmpSQL = '' SET @GetGenericDrugStrengths = CURSOR FOR SELECT StrengthID, GenericDrugDetailsID, DosageStrength, PresentationUnitID, DosageFormID, RouteOfAdministrationID FROM Pharmacy_Strengths ORDER BY GenericDrugDetailsID ASC OPEN @GetGenericDrugStrengths FETCH NEXT FROM @GetGenericDrugStrengths INTO @StrengthID, @GenericDrugDetailsID, @DosageStrength, @PresentationUnitID, @DosageFormID, @RouteOfAdministrationID WHILE @@FETCH_STATUS = 0 BEGIN --Get the values of Presentation Unit, Dosage Form, and Route of Administration. SELECT @PName = PresentationUnitName FROM Pharmacy_PresentationUnit WHERE PresentationUnitID = @PresentationUnitID SELECT @DName = DosageFormName, @DNameAbbrev = DosageFormNameAbbrev FROM Pharmacy_DosageForm WHERE DosageFormID = @DosageFormID SELECT @RName = RouteOfAdministrationName FROM Pharmacy_RouteOfAdministration WHERE RouteOfAdministrationID = @RouteOfAdministrationID IF (@GenericDrugDetailsID = @CurrGenericDrugDetailsID) BEGIN SET @nCombinations = (@nCombinations + 1) --Alter the temporary table now SET @tmpSQL = @tmpSQL + 'UPDATE #tmpStrengths SET StrengthID' + CAST(@nCombinations AS VARCHAR(50)) + ' = ' + CAST(@StrengthID AS VARCHAR(50)) + ', DosageStrength' + CAST(@nCombinations AS VARCHAR(50)) + ' = ' + CAST(@DosageStrength AS VARCHAR(50)) + ', PresentationUnitID' + CAST(@nCombinations AS VARCHAR(50)) + ' = ' + CAST(@PresentationUnitID AS VARCHAR(50)) + ', PresentationUnitName' + CAST(@nCombinations AS VARCHAR(50)) + ' = ''' + CAST(@PName AS VARCHAR(100)) + ''', DosageFormID' + CAST(@nCombinations AS VARCHAR(50)) + ' = ' + CAST(@DosageFormID AS VARCHAR(50)) + ', DosageFormName' + CAST(@nCombinations AS VARCHAR(50)) + ' = ''' + CAST(@DName AS VARCHAR(100)) + ''', DosageFormNameAbbrev' + CAST(@nCombinations AS VARCHAR(50)) + ' = ''' + CAST(@DNameAbbrev AS VARCHAR(50)) + ''', RouteOfAdministrationID' + CAST(@nCombinations AS VARCHAR(50)) + ' = ' + CAST(@RouteOfAdministrationID AS VARCHAR(50)) + ', RouteOfAdministrationName' + CAST(@nCombinations AS VARCHAR(50)) + ' = ''' + CAST(@RName AS VARCHAR(100)) + ''' WHERE GenericDrugDetailsID = ' + CAST(@GenericDrugDetailsID AS VARCHAR(50)); EXEC(@tmpSQL); END ELSE BEGIN SET @nCombinations = 1 SET @CurrGenericDrugDetailsID = @GenericDrugDetailsID; --Get the total number of combinations in advance SET @CurrCombinationTotal = (SELECT COUNT(GenericDrugDetailsID) FROM Pharmacy_Strengths WHERE GenericDrugDetailsID = @GenericDrugDetailsID GROUP BY GenericDrugDetailsID); --Insert in the temporary table now INSERT INTO #tmpStrengths (StrengthID, GenericDrugDetailsID, NumberOfCombinations, DosageStrength1, PresentationUnitID1, PresentationUnitName1, DosageFormID1, DosageFormName1, DosageFormNameAbbrev1, RouteOfAdministrationID1, RouteOfAdministrationName1) VALUES (@StrengthID, @GenericDrugDetailsID, @CurrCombinationTotal, @DosageStrength, @PresentationUnitID, @PName, @DosageFormID, @DName, @DNameAbbrev, @RouteOfAdministrationID, @RName) END --PRINT CAST(@StrengthID AS varchar(50)) + ' ' + CAST(@GenericDrugDetailsID AS varchar(50)) + ' ' + CAST(@DosageStrength AS varchar(50)) + ' ' + CAST(@PresentationUnitID AS varchar(50)) + ' ' + CAST(@DosageFormID as varchar(50)) + ' ' + CAST(@RouteOfAdministrationID as varchar(50)) FETCH NEXT FROM @GetGenericDrugStrengths INTO @StrengthID, @GenericDrugDetailsID, @DosageStrength, @PresentationUnitID, @DosageFormID, @RouteOfAdministrationID END --SELECT * from #tmpStrengths CLOSE @GetGenericDrugStrengths DEALLOCATE @GetGenericDrugStrengths SELECT a.GenericDrugID, a.GenericDrugName, f.*, a.InsertDate, a.InsertFKUserAccountId, a.UpdateDate, a.UpdateFKUserAccountId, a.Version FROM Pharmacy_GenericDrug a INNER JOIN Pharmacy_ControlStatus d ON d.ControlStatusID = a.ControlStatusID INNER JOIN Pharmacy_GenericDrugDetails e ON e.GenericDrugID = a.GenericDrugID INNER JOIN #tmpStrengths f ON f.GenericDrugDetailsID = e.GenericDrugDetailsID ORDER BY GenericDrugName ASCThis is what i get before the query:
GenericDrugID GenericDrugName DrugSubClassificationID DrugSubClassificationName DrugClassificationID DrugClassificationName GenericDrugDetailsID DosageStrength PresentationUnitID PresentationUnitName DosageFormID DosageFormName DosageFormNameAbbrev RouteOfAdministrationID RouteOfAdministrationName ControlStatusID ControlStatusName InsertDate InsertFKUserAccountId UpdateDate UpdateFKUserAccountId Version ------------------------------------ ---------------------------------------------------------------------------------------------------- ------------------------------------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -------------------- -------------- ------------------ ---------------------------------------------------------------------------------------------------- ------------ ---------------------------------------------------------------------------------------------------- -------------------------------------------------- ----------------------- ---------------------------------------------------------------------------------------------------- --------------- ---------------------------------------------------------------------------------------------------- ----------------------- --------------------- ----------------------- --------------------- ----------------------- 83222B76-6690-42F2-BDAD-BE5BD2D19D3B Generic Drug One 8ED135ED-5FDB-419A-9C7D-E788A40EAEAC Drug Subclassification Two 61D618F3-A38A-4416-B0A4-FB29AD614B4B Drug Classification One 2 300 1 ml 2 Pill Pill 1 Mouth 3 Narcotic 2009-10-25 10:10:06.077 1 2009-11-15 07:06:03.733 1 2009-10-25 10:10:06.077 83222B76-6690-42F2-BDAD-BE5BD2D19D3B Generic Drug One 8ED135ED-5FDB-419A-9C7D-E788A40EAEAC Drug Subclassification Two 61D618F3-A38A-4416-B0A4-FB29AD614B4B Drug Classification One 2 400 1 ml 2 Pill Pill 1 Mouth 3 Narcotic 2009-10-25 10:10:06.077 1 2009-11-15 07:06:03.733 1 2009-10-25 10:10:06.077 83222B76-6690-42F2-BDAD-BE5BD2D19D3B Generic Drug One 8ED135ED-5FDB-419A-9C7D-E788A40EAEAC Drug Subclassification Two 61D618F3-A38A-4416-B0A4-FB29AD614B4B Drug Classification One 4 500 1 ml 2 Pill Pill 2 Injection 3 Narcotic 2009-10-25 10:10:06.077 1 2009-11-15 07:06:03.733 1 2009-10-25 10:10:06.077 A1D86FD2-2E65-4F2A-B7A2-7B083B71AB9B Generic Drug Two 9925D762-34B8-43B4-A96B-78374F0081B0 Drug Subclassification One C10E9F1B-3985-4DB8-8EF8-A6C82B004B9F Drug Classification Two 1 200 1 ml 2 Pill Pill 1 Mouth 2 None 2009-10-25 10:47:10.623 1 2009-11-15 04:02:47.890 1 2009-10-25 10:47:10.623This is what i get now:
GenericDrugID GenericDrugName DrugSubClassificationID DrugSubClassificationName DrugClassificationID DrugClassificationName StrengthID GenericDrugDetailsID NumberOfCombinations DosageStrength1 PresentationUnitID1 PresentationUnitName1 DosageFormID1 DosageFormName1 DosageFormNameAbbrev1 RouteOfAdministrationID1 RouteOfAdministrationName1 StrengthID2 DosageStrength2 PresentationUnitID2 PresentationUnitName2 DosageFormID2 DosageFormName2 DosageFormNameAbbrev2 RouteOfAdministrationID2 RouteOfAdministrationName2 InsertDate InsertFKUserAccountId UpdateDate UpdateFKUserAccountId Version ------------------------------------ ---------------------------------------------------------------------------------------------------- ------------------------------------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ----------- -------------------- -------------------- --------------- ------------------- ---------------------------------------------------------------------------------------------------- ------------- ---------------------------------------------------------------------------------------------------- -------------------------------------------------- ------------------------ ---------------------------------------------------------------------------------------------------- ----------- --------------- ------------------- ---------------------------------------------------------------------------------------------------- ------------- ---------------------------------------------------------------------------------------------------- -------------------------------------------------- ------------------------ ---------------------------------------------------------------------------------------------------- ----------------------- --------------------- ----------------------- --------------------- ----------------------- 83222B76-6690-42F2-BDAD-BE5BD2D19D3B Generic Drug One 8ED135ED-5FDB-419A-9C7D-E788A40EAEAC Drug Subclassification Two 61D618F3-A38A-4416-B0A4-FB29AD614B4B Drug Classification One 2 2 2 300 1 ml 2 Pill Pill 1 Mouth 3 400 1 ml 2 Pill Pill 1 Mouth 2009-10-25 10:10:06.077 1 2009-11-15 07:06:03.733 1 2009-10-25 10:10:06.077 83222B76-6690-42F2-BDAD-BE5BD2D19D3B Generic Drug One 8ED135ED-5FDB-419A-9C7D-E788A40EAEAC Drug Subclassification Two 61D618F3-A38A-4416-B0A4-FB29AD614B4B Drug Classification One 4 4 1 500 1 ml 2 Pill Pill 2 Injection NULL NULL NULL NULL NULL NULL NULL NULL NULL 2009-10-25 10:10:06.077 1 2009-11-15 07:06:03.733 1 2009-10-25 10:10:06.077 A1D86FD2-2E65-4F2A-B7A2-7B083B71AB9B Generic Drug Two 9925D762-34B8-43B4-A96B-78374F0081B0 Drug Subclassification One C10E9F1B-3985-4DB8-8EF8-A6C82B004B9F Drug Classification Two 1 1 1 200 1 ml 2 Pill Pill 1 Mouth NULL NULL NULL NULL NULL NULL NULL NULL NULL 2009-10-25 10:47:10.623 1 2009-11-15 04:02:47.890 1 2009-10-25 10:47:10.623For those interested these are the table structures:
CREATE TABLE [dbo].[Pharmacy_GenericDrug]( [GenericDrugID] [uniqueidentifier] NOT NULL CONSTRAINT [DF__Pharmacy___Gener__4E53A1AA] DEFAULT (newid()), [GenericDrugName] [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL, [DrugSubClassificationID] [uniqueidentifier] NOT NULL, [ControlStatusID] [int] NOT NULL, [InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrug_InsertDate] DEFAULT (getdate()), [InsertFKUserAccountId] [int] NOT NULL, [UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrug_UpdateDate] DEFAULT (getdate()), [UpdateFKUserAccountId] [int] NOT NULL, [Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrug_Version] DEFAULT (getdate()) ) CREATE TABLE [dbo].[Pharmacy_GenericDrugDetails]( [GenericDrugDetailsID] [int] IDENTITY(1,1) NOT NULL, [GenericDrugID] [uniqueidentifier] NOT NULL, [InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrugDetails_InsertDate] DEFAULT (getdate()), [InsertFKUserAccountId] [int] NOT NULL, [UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrugDetails_UpdateDate] DEFAULT (getdate()), [UpdateFKUserAccountId] [int] NOT NULL, [Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrugDetails_Version] DEFAULT (getdate()) ) CREATE TABLE [dbo].[Pharmacy_Strengths]( [StrengthID] [int] IDENTITY(1,1) NOT NULL, [GenericDrugDetailsID] [int] NOT NULL, [DosageStrength] [int] NOT NULL, [PresentationUnitID] [int] NOT NULL, [DosageFormID] [int] NOT NULL, [RouteOfAdministrationID] [int] NOT NULL, [InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_StrengthCombination_InsertDate] DEFAULT (getdate()), [InsertFKUserAccountId] [int] NOT NULL, [UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_StrengthCombination_UpdateDate] DEFAULT (getdate()), [UpdateFKUserAccountId] [int] NOT NULL, [Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_StrengthCombination_Version] DEFAULT (getdate()) ) CREATE TABLE [dbo].[Pharmacy_PresentationUnit]( [PresentationUnitID] [int] IDENTITY(1,1) NOT NULL, [PresentationUnitName] [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL, [InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_PresentationUnit_InsertDate] DEFAULT (getdate()), [InsertFKUserAccountId] [int] NOT NULL, [UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_PresentationUnit_UpdateDate] DEFAULT (getdate()), [UpdateFKUserAccountId] [int] NOT NULL, [Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_PresentationUnit_Version] DEFAULT (getdate()) ) CREATE TABLE [dbo].[Pharmacy_DosageForm]( [DosageFormID] [int] IDENTITY(1,1) NOT NULL, [DosageFormName] [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL, [DosageFormNameAbbrev] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL, [InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_DosageForm_InsertDate] DEFAULT (getdate()), [InsertFKUserAccountId] [int] NOT NULL, [UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_DosageForm_UpdateDate] DEFAULT (getdate()), [UpdateFKUserAccountId] [int] NOT NULL, [Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_DosageForm_Version] DEFAULT (getdate()) ) CREATE TABLE [dbo].[Pharmacy_RouteOfAdministration]( [RouteOfAdministrationID] [int] IDENTITY(1,1) NOT NULL, [RouteOfAdministrationName] [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL, [InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_RouteOfAdministration_InsertDate] DEFAULT (getdate()), [InsertFKUserAccountId] [int] NOT NULL, [UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_RouteOfAdministration_UpdateDate] DEFAULT (getdate()), [UpdateFKUserAccountId] [int] NOT NULL, [Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_RouteOfAdministration_Version] DEFAULT (getdate()) )讨论(0) -
OK, let's take a stab and see if this gets us anywhere.
Table A: GenericTbl(Id, Name, ...)
Table B: GenericDetails(Id, GenericId, ...)
Table C: Strengths(Id, GenericDetailsId, Strength, Unit, DosageForm, ...)
If when you say merge you're looking for an output set which puts the results together for the strengths of a single generic you could do something along the lines of
SELECT g.Id, g.Name, gd.Id, s.Strength, s.Unit, s.OtherFields /*fill in the blanks*/ FROM GenericTbl g INNER JOIN GenericDetails gd on g.Id=gd.GenericId INNER JOIN Strengths s ON gd.Id=s.GenericDetailsId ORDER BY g.Id, gd.Id, s.Idand that'd give you a single results set listing all the different strengths for each of the generics, grouped their types, with each result on one row.
If what you want is a single row per type with columns to tell you the options available, it should be doable with cursors and temporary tables, or pivots I think from memory.
If what you're actually looking for is for the records to be merged on insert into the database so you only have a single underlying record which contains all the data then you could do it through triggers, but I can't quite see why you'd want to because you'd end up with a 1:1 mapping for B and C and might as well just have them as a single table.
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Here is another solution using SQLXML:
SELECT STUFF ( ( SELECT ', ' + cast(id AS NVARCHAR(max)) + ': ' + video FROM Video ORDER BY Id FOR XML PATH ('') ),1,1,'' ) CREATE TABLE [dbo].[Video]( [ID] [int] NOT NULL, [Video] [varchar](50) NOT NULL, [Views] [int] NOT NULL )Result: 1: Hulk, 2: Jack, 3: The King
Update: I also just found this at Data Management and Exchange.
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