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Planned

Support accumulating variable changes within a query

There are several cases in SQL where it's necessary to update a variable once per row in a result, accumulating all of the changes together.


A sample of code that works in SQL Server:


DECLARE @InvoicesList VARCHAR(1024) 
 
SELECT @InvoicesList = COALESCE(@InvoicesList + ', ', '') + pay.[InvoiceNumber] 
FROM Payments AS pay 
WHERE pay.Order_id = @orderId 
ORDER BY pay.[InvoiceNumber] 
 
RETURN @InvoicesList

'

VistaDB presently returns the last column value.  Please vote this up!

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