troubleshooting Question

*** Need multi-part query using SQL RANK function - Tricky !!!!

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giggul asked on
Microsoft SQL ServerMicrosoft SQL Server 2005Oracle Database
15 Comments2 Solutions564 ViewsLast Modified:
Hello experts!  I'm new here and hope you can help.  This is a tricky problem I have:

I have a table of customers' phone numbers.  A customer can have multiple phone numbers and multiple phone types (home, work, mobile, etc)... and any combination of such (2 home numbers and 1 work number, etc).  They can designate which number is "preferred"... and each customer may have multiple preferred" numbers.  Each record has a create date.

My problem:
I need a single row returned for each customer with a single preferred phone number.  
-  If a customer has one preferred phone number, then we will use that one.  
-  If they have multiple preferred phone numbers, then we use the most recent created one.
-  If they have no preferred phone number(s) identfied, then we use the most recent created one.

I will upload a sample data file shortly (could not attach it directly to this post)

Thank you so much!!
Lee Wadwell
Project Architect

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