Data type mismatch while fetching data from one table into another - sql

Question

I'm trying to get data from a table CustomerCase of database TD_EDD; into a table CustomerCase of database DsVelocity. The problem is whenever I try to get the data, error message is generated because in CustomerCase table of TD_EDD database, there are 3 columns: LOB, ReferralSource and CaseType of type varchar; while in CustomerCase table of DsVelocity database, the 3 matching columns are LOBID, ReferralSourceID and CaseTypeID and are of type int.
I've simply tried to execute this query:
INSERT INTO [DsVelocity].[dbo].[CustomerCase]
([CustomerID]
,[Tier]
,[EscalationDate]
,[ReferralSourceID]
,[ICMSID]
,[LOBID]
,[TriggerRC]
,[TriggerAccount]
,[Project]
,[CaseTypeID]
,[DateDue]
,[SARFiledYes]
,[SARFiledNo]
,[TeamLead]
,[SARAmount]
,[InitialNotes]
,[WorkFlowStatus]
,[CaseDecision]
,[AccountsReviewed]
,[ActionDate]
,[SecondLvlReview]
,[CompanyType]
,[IfOther]
,[ClientType]
,[MergeFlag]
,[MergeCaseID]
,[AMLREP]
,[HighRiskYes]
,[HighRiskNo]
,[AutoCreated]
,[FileName]
,[SourceRefDate]
,[SourceRefID]
,[ETMAdd]
,[ETMRemove]
,[ETMDate]
,[Investigator]
,[InUseBy])
SELECT [CustomerID]
,[Tier]
,[EscalationDate]
,[ReferralSource]
,[ICMSID]
,[LOB]
,[TriggerRC#]
,[TriggerAccount]
,[Project]
,[CaseType]
,[DateDue]
,[SARFiledYes]
,[SARFiledNo]
,[TeamLead]
,[SARAmount]
,[InitialNotes]
,[WorkFlowStatus]
,[CaseDecision]
,[AccountsReviewed]
,[ActionDate]
,[2ndLvlReview]
,[CompanyType]
,[IfOther]
,[ClientType]
,[MergeFlag]
,[MergeCaseID]
,[AMLREP]
,[HighRiskYes]
,[HighRiskNo]
,[AutoCreated]
,[FileName]
,[SourceRefDate]
,[SourceRefID]
,[ETMAdd]
,[ETMRemove]
,[ETMDate]
,[Investigator]
,[InUseBy]
FROM [TD_EDD].[dbo].[CustomerCase]
and then ran into the following error:
Msg 245, Level 16, State 1, Line 1
Conversion failed when converting the varchar value 'CRR' to data type int.
CRR is a data in the column ReferralSource.
Similar messages may appear in case of LOB and CaseType columns
The database server I'm using is MSSQL Server 2008 R2.
What is the solution to this problem???
EDIT-1: Tried using Inner Join with LOB, CaseType and ReferralSource tables. Now the error has disappeared, query ran ok, but I get data from only 2 rows. I can't understand why?????? I had more than 40 data in the [TD_EDD].[dbo].[CustomerCase] table, so all these data were supposed to be passed to the [DsVelocity].[dbo].[CustomerCase] table. What's wrong?
EDIT-2: Got it. CaseType column in [TD_EDD].[dbo].[CustomerCase] had mostly NULL values, only 2 rows had valid data. Hence, only 2 rows were sent to [DsVelocity].[dbo].[CustomerCase] becasue no corresponding ID match can be made for null values. I guess I figured it out myself. Thanks everyone.

Answer 1

You could try casting as already suggested or probably you're referring the wrong field name, like (I shall focus only on the one that has an error):
SELECT
,[ReferralSourceID]
,[LOBID]
,[CaseTypeID]
FROM [TD_EDD].[dbo].[CustomerCase]
Instead of ReferralSource use ReferralSourceID, instead of LOB use LOBID and instead of CaseType use CaseTypeID.
Or probably you need to reference the Reference Table on those fields like:
SELECT
,[ReferralSourceID]
,[LOBID]
,[CaseTypeID]
FROM [TD_EDD].[dbo].[CustomerCase] CC
INNER JOIN Referral R
ON CC.ReferralSource = R.ReferralSource
INNER JOIN LobTbl L
ON CC.LOB = L.LOB
INNER JOIN CaseTypeTbl C
ON CC.CaseType = C.CaseType

Answer 2

Try casting your varchar columns to int (assuming the data in your source columns is valid for int columns in target)
SELECT CAST(ReferralSource AS int),
CAST(LOB AS int),
CAST(CaseType AS int)
--etc