vb.net barcode scanner source code 12: A Few Ideas: PowerPivot and DAX Solutions in Microsoft Office

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12: A Few Ideas: PowerPivot and DAX Solutions
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Perhaps a word of caution is necessary for those readers who have a BI background In traditional BI solutions, the time dimension often has an integer (Whole Number) surrogate dimension key The foreign keys that relate to this from fact tables are also integers The SQL Server sample database, AdventureWorksDW2008, uses an intelligent key (for example, 20030701) rather than a surrogate key, but it s still an integer DAX time intelligence functions require a date that s a date data type You have to convert the primary and foreign keys to dates Once that s done, remove the integer key relationship and relate the two tables on date The DAX to convert an intelligent integer key (in the form of 20030701) to a date is as follows:
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=DATE(LEFT(DimDate[DateKey],4),MID(DimDate[DateKey],5,2), RIGHT(DimDate[DateKey],2))
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Prac tical PowerPivot & DAX Formulas for Excel 2010
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If you have the ContosoRetailDW SQL Server sample database, you don t have to do this the primary and foreign keys are already dates
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Sorting on dates, especially months, is not always an out-of-the-box solution If you add month numbers to Column Labels or Row Labels or to a slicer, they should sort correctly However, your users will likely prefer to see month names Naturally enough, these are going to sort alphabetically which is not what you want The problem is illustrated in Figure 12-8 for Row Labels, and in Figure 12-9 for a slicer
12: A Few Ideas: PowerPivot and DAX Solutions
Figure 12-5
Select Calendars dialog
Neither looks that good The solution to the problem depends on whether it s Column Labels/Row Labels or a slicer Here are some simple steps to sort month names correctly in either Column Labels or Row Labels:
1 2
Add Sales Amount to Values, and Year, Quarter, and MonthName (the formulas for these date parts are at the start of this chapter) to Row Labels Right-click on any month name Choose Sort followed by Sort A to Z This does not sort alphabetically! When you choose this option, Excel s own intelligent sorting algorithm takes over For this to work you must use standard names for the months, for example, Jan or January FirstMonth as a name would not work The pivot table, shown in Figure 12-10 now has the month names sorting correctly
Prac tical PowerPivot & DAX Formulas for Excel 2010
Figure 12-6
Schema Generation Progress dialog
Figure 12-7
Generated time dimension in PowerPivot
12: A Few Ideas: PowerPivot and DAX Solutions
Figure 12-8
Month names in Row Labels
Unfortunately, the previous steps do not apply to slicers For a slicer, you have to prepend the month name with the month number This is not perfect, and will not be necessary in the next release of PowerPivot But for now, here are the steps to sort on month name correctly in a slicer:
Add a calculated column to the Orders table and enter the following DAX formula:
=IF(LEN([Month]) = 1,"0" & [Month] & " - " & [MonthName], [Month] & " - " & [MonthName])
Use this calculated column in the slicer The result is shown in Figure 12-11 Please note that the zero in front of single-digit month numbers is necessary for a correct sort
Figure 12-9
Month names in a slicer
Prac tical PowerPivot & DAX Formulas for Excel 2010
Figure 12-10 Month names sorting correctly in Row Labels
Figure 12-11 Month names sorting correctly in a slicer
12: A Few Ideas: PowerPivot and DAX Solutions
Numbers That Don t Add Up
Many numbers (whether from calculated columns or calculated measures) can be aggregated in all situations In our Northwind PowerPivot model, such numbers are Quantity and Sales Amount from the Order Details table It makes sense to see subtotals and totals for these numbers, whether by product or employee or customer or date Such numbers are full-additive numbers Some numbers, however, can never be usefully aggregated or only aggregated in certain circumstances The former are called non-additive numbers and the latter, semi-additive numbers A semi-additive number might be a bank balance If you have two bank accounts, you can add them together to give you your total balance Unfortunately, you can t add them together solely by time! If you had $100 in your account last week and $200 this week, sadly, you don t necessarily have $300 Bank balances are only additive in certain circumstances A non-additive number might be an inventory figure If you have 10 of the product Chai in stock and 20 of the product Chang, it might not be meaningful to say you had 30 in stock That is a business decision; you could argue that to say you had 30 products in stock was sensible To take another example, if you had 10 Chai last week and 5 Chai this week, the answer is probably not 15 Maybe the answer is 5, the last non-blank value (there is a DAX function called LASTNONBLANK(), which is very useful when looking at totals across time) This section deals with non-additive and semi-additive numbers in a pivot table Take a look at Figure 12-12 The pivot table is filtered to show only a few products You might conclude that the grand total for UnitsInStock (from the Products table) is not a valid total What if you would prefer to hide this total You can easily hide the grand total for UnitsInStock by going through the Grand Totals button in the Layout group of the PivotTable Tools/Design ribbon However, that is also going to hide the total for Sales Amount, which is perfectly valid and may be required by end users Here s an approach that can be used to selectively hide totals Add a new measure to the pivot table with the following formula:
=IF(COUNTROWS(VALUES(Products[ProductName]))=1,SUM(Products[UnitsInStock]))
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