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troubleshooting Question

SQL Correlated Subquery in SELECT clause

Avatar of pzozulka
pzozulka asked on
Microsoft SQL ServerMicrosoft SQL Server 2008SQL
10 Comments1 Solution601 ViewsLast Modified:
I have a query that returns the following data:

Name            Age      Phone
John Smith    40        555-5555
John Smith    40        222-2222

I want it to only return a single row, because this is causing us to have duplicates in the report.
Current Query
Select Contact.Name, Contact.Age, ContactInfo.Phone
From Contact left join ContactInfo on Contact.Id = ContactInfo.Id

New Query
Select Contact.Name, Contact.Age, 
 ( Select TOP 1 CI.Phone
   From ContactInfo CI left join Contact C ON C.Id = CI.Id
   Where C.Id = Contact.Id
   Order By CI.Phone ASC
 ) as Phone
From Contact left join ContactInfo on Contact.Id = ContactInfo.Id

Is there anything you see wrong with the correlated subquery? It's giving me an error message:

Column 'Contact.Id' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.