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 Join on a field in CONVERT statement
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Starting Member

3 Posts

Posted - 10/05/2012 :  08:46:42  Show Profile  Reply with Quote

I have the following query:
			CAST(r.ContractID AS NVARCHAR) + '-' + CAST(r.repID AS NVARCHAR)
FROM #recon r
INNER JOIN SalesForceLocal.dbo.[User] AS u with (nolock) ON r.RepId = u.Employee_ID__c
LEFT JOIN salesforcelocal.dbo.Account AS a WITH (NOLOCK) ON r.SPID = a.SPID__c
LEFT JOIN SalesForceLocal.dbo.Opportunity AS o with (nolock) ON r.ContractId = o.Contract_ID__c

ContractID is an integer field in the #recon temp table I created. I need to create an external primary key, so I created concatenation of the RepId (which an int too) and ContractId. I'm having issues now because I need to use ContractId as a field to join onto the Opportunity table. Since I changed it to a nvarchar, it refuses to join now. I was just going to create another temp table and join it on there, but I know there has to be an easier way to do this. Any suggestions?

Flowing Fount of Yak Knowledge

5155 Posts

Posted - 10/05/2012 :  09:00:59  Show Profile  Reply with Quote
I must admit I didn't follow 100% what your requirements are. You do seem to be joining to the Opportunity table using the integer ContractID column.

As I see it, your choices are:

1. Keep all three columns ContractID, RepID and the concatenated column and join on the ContractID column

2. Instead of concatenating to create a character column, use a composite primary key consisting of two columns - ContractID and RepID.

I would prefer the second option, for a variety of reasons.

As an aside, although it would probably make no difference in your specific case, a recommended best practice is to always specify the length for NVARCHAR columns - for example NVARCHAR(30)
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