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Figure A-10 Top 10 percent earners
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Prac tical PowerPivot & DAX Formulas for Excel 2010
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Figure A-11 Denormalized data
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Denormalizing Data
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As an alternative to the DAX RELATED() function, you can denormalize your data before it reaches PowerPivot with a SQL Inner Join (PowerPivot table result shown in Figure A-11):
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select EnglishProductName, EnglishProductSubcategoryName from DimProduct inner join DimProductSubcategory on DimProductProductSubcategoryKey = DimProductSubcategoryProductSubcategoryKey
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Self-Join
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The Northwind Employees table is joined to itself This is called a self-join, and this type of join is not supported in PowerPivot If you wanted to browse employee sales by manager in a pivot table, you have to join the table to itself in a SQL query Here s the syntax for joining the Employees table to itself (PowerPivot table result shown in Figure A-12):
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select EEmployeeID, ELastName, EFirstName, MLastName + ', ' + MFirstName as Manager from employees as E left outer join employees as M on EReportsTo = MEmployeeID
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Please note this is a left outer join, not an inner join An inner join would not return Andrew Fuller as an employee because he is the CEO of Northwind and has no manager! You may want to include him, as he has sales in the Orders table This query is against the Northwind and not the AdventureWorksDW2008 database
Appendix A: SQL Queries for PowerPivot
Figure A-12 Self-join data
Grouping Data
You may want to group imported data, and perhaps use SQL aggregate functions, such as SUM(), rather than the DAX equivalents Following is an example using the Group By clause (PowerPivot table result shown in Figure A-13):
select ProductKey, OrderDateKey, sum(OrderQuantity) As SumOrderQuantity from FactInternetSales group by ProductKey, OrderDateKey
Stored Procedure
Often, you may not have permissions to query tables directly Perhaps your SQL Server DBA only allows access to data through stored procedures if that is so, you can t write queries against the tables, nor can you import the tables directly Here s some sample
Figure A-13 Grouping data
Prac tical PowerPivot & DAX Formulas for Excel 2010
Figure A-14 Stored procedure result data
code to create a parameterized stored procedure (sometimes stored procedures can return data faster than a normal Select statement):
create procedure spGetCustomersByEducation @education nvarchar(40) as begin set nocount on select Firstname, Lastname, EnglishEducation, EnglishOccupation from DimCustomer where englisheducation = @education end
Whether you create your own stored procedures, or use those created by others, you need to call the stored procedure to return the data Here s an example that returns data from the stored procedure created in the preceding code (PowerPivot table result shown in Figure A-14):
exec spGetCustomersByEducation @Education = 'Partial College'
SQL Queries for Excel
You may be surprised to learn that you can write SQL queries against Excel worksheets! You might also ask why anyone should want to do so, when PowerPivot supports imports from Excel worksheets directly The answer may be that you want to include complex filters and/or join the Excel data to a table from another source T-SQL supports the concept of a linked server the linked server does not have to be SQL Server, yet you can query it from T-SQL Here is some sample code to set up Excel as a linked
Appendix A: SQL Queries for PowerPivot
server using T-SQL (please note, this is no longer generic SQL and may not work in other SQL dialects):
exec sp_addLinkedServer @server='MyExcel', @srvproduct='ACE 120', @provider='MicrosoftACEOLEDB120', -- this is a comment -- in the next line, specify a valid path to an Excel workbook @datasrc='C:\users\art\documents\book1xlsx', @provstr='Excel 120;HDR=No'
There are three occurrences of 120 in the code The number you specify may be different You can establish the correct number (it s actually the Office version number) by looking at linked server providers in Object Explorer After setting up the linked server, you can then query the Excel workbook using SQL:
select * from myexcelsheet1$
If you are tempted to try this, there are a few things to consider First, your SQL Server DBA may disapprove of permanent linked servers (there are alternatives, such as Openrowset) Second, you ll need some sensible data in the workbook it s helpful to have column headers in the first row (if you do, replace HDR=No with HDR=Yes in the above syntax) Third, there are three dots between the linked server name and the worksheet name in the preceding syntax (for SQL Server users, Excel does not have a concept of a database name, nor a schema name the dots are placeholders) Fourth, instead of the worksheet name (sheet1$), you can use the name of an Excel named range it s also possible to query cells and unnamed ranges Of course, there is rather more to SQL than this! This appendix is designed to help readers who are not familiar with SQL get started with writing their own SQL queries for PowerPivot
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