I'm no expert, but can I still reply?
What you need is a crosstab query, which is pretty straightforward given a known number of tariffs and the fact that you even supplied a tariff order column.
SELECT Customer, Count=COUNT(*)
,tariff1=MAX(CASE TariffOrder WHEN 1 THEN Tariff END)
,tariff2=MAX(CASE TariffOrder WHEN 2 THEN Tariff END)
,tariff3=MAX(CASE TariffOrder WHEN 3 THEN Tariff END)
,tariff4=MAX(CASE TariffOrder WHEN 4 THEN Tariff END)
FROM #Cust
GROUP BY Customer
Very nice job of posting DDL, sample data and expected results by the way.
My thought question: Have you ever been told that your query runs too fast?
My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.
Need to UNPIVOT? Why not CROSS APPLY VALUES instead?[/url]
Since random numbers are too important to be left to chance, let's generate some![/url]
Learn to understand recursive CTEs by example.[/url]
[url url=http://www.sqlservercentral.com/articles/St