Using material from item c and

To avoid either of these messages and get meaningful resultsit is best to have test data points that are widely separated in at least two of the three parameters Voltage, Current, and RPM. Entering Motor Data from a Catalog If all you have available to you is the data from a manufacturer's or mail order company's catalog, you may still have the information that MotoCalc needs to determine the motor characteristics.

Using material from item c and

One of these transformations is grouping rows by number of fields. If you use the graphical user interface in Power Query for Power BI or Excel you have number of options to get some aggregated results such as count of rows, maximum or minimum, average of each group, or sum… But there are still heaps of operations that you cannot do through GUI, such as getting the last item in each group, or first item.

You can download it from here. Scenario Scenario that I want to solve as an example is this: FactInternetSales has sales transaction information for each customer, by each product, each order date and some other information.

We want to have a grouped table by customer, which has the number of sales transaction by each customer, total sales amount for that customer, the first and the last sales amount for that customer.

First and last defined by the first and last order date for the transaction. Click on Edit to move into Power Query window. This will open the Group By dialog window with some configuration options By default Group By happens on the selected columns.

You can change this to another column and add or remove columns in this section. Choose the Group By Field Based on your final grain of the output table the group by field will be defined.

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In this example we want the final table to have one record per Customer, so CustomerKey which is the identifier for each customer should be our Group By Column. Note that you can add as many fields as you want in the Group By section. In addition you can also have some aggregated columns.

Here are list of operations you can have by default: Most of items above are self explanatory. For example; when you want to count number of sales transaction.

If you want total Sales amount for each group you can choose Sum, and then in the Column section choose the column as SalesAmount. All Rows will generate a sub table in each element of the aggregated table that contains all rows in that group.

Columns that I want to create in this section are: This detailed view can be used for many other calculations or transformations later on. In many cases you will find the All rows option useful. However not all types of operations are listed there.

For example in detailed table above you can see that customer had 9 sales transaction, and they happened in different Order dates, getting the first and last order date is easy with Max and Min operations.

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Fortunately we can use M Power Query formula language to achieve this easily. Sort By Date To get the first or last item in each group I have to order the table based on that date column.

Using material from item c and

Sorting is possible simply through GUI. Click on Insert to confirm you want to insert it here before the Grouped Rows. This means Grouped Rows will use the output of Sorted Rows step as the input for grouping which is exactly what we want. All we need from here is to get the first and last item in the sub table.

Last Fortunately Power Query has a bunch of operations on List that we can use. First will return the first item in the list based on the order defined in the listand List. Last will return the last item. To make changes here you need to go to script editor in Power Query which can be achieve via Advanced Editor option in Home tab.

You have to make sure that you are in the FactInternetSales Query first. Advanced Editor will show you M script that build the output and the group by command as well.Material World: A Global Family Portrait [Peter Menzel, Charles C.

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