Question

I am trying to pivot a table into a view which would be more easily manipulable with Excel. I am creating views in Sql Server that can be read by the accounting department in order to create stats and other cross-table pivot in Excel.

The table in its current format

OccupationId | ProductId | IsGroup | IsAdditionalNight | Price
-------------+-----------+---------+-------------------+------
1            | 47        | 0       | 0                 | 50
2            | 47        | 0       | 1                 | 45
3            | 47        | 1       | 0                 | 30
4            | 47        | 1       | 1                 | 28

The View format that I want to expose

ProductId | Price | AdditionalNight | GroupPrice | GroupAdditionalNight
----------+-------+-----------------+------------+---------------------
47        | 50    | 45              | 30         | 28

How can I achieve that in Sql Server 2008 R2 ? I need the query to be fast since it will be part of a bigger Query (using CTE).

Currently the only way that I am thinking is to include 4 sub queries to get all 4 prices individually, but I don’t like the approach and it scan the table 4 times.

Answer 1

SELECT ProductId,
MAX(CASE 
 WHEN IsGroup=0 AND IsAdditionalNight =0 then Price
 END) as [Price],
MAX(CASE 
 WHEN IsGroup=0 AND IsAdditionalNight =1 then Price
 END) as [AdditionalNight],
MAX(CASE 
 WHEN IsGroup=1 AND IsAdditionalNight =0 then Price
 END) as [GroupPrice],
MAX(CASE 
 WHEN IsGroup=1 AND IsAdditionalNight =1 then Price
 END) as [GroupAdditionalNight] 

 FROM table1     
GROUP BY ProductId

Or you can do the same using PIVOT (Personally I found the syntax of PIVOT more complex than approach above, but there is no performance difference, and some people prefer PIVOT).