When you transform data using Power Query it will often automatically promote the headers (use first rows headers) and guess the data types for each column. You can stop it doing this.
When working with some large data sets in Power Query it may be useful to default your Close and Load option to Connection Only rather than a Table. That way if you do strike an issue it won’t take ages to load to data.
Power Query does not have an IFERROR function. It does however have another function that performs the same type of calculation.
Let’s say that you need to create a list of files in a folder. This is possible using VBA, but it is also possible in Power Query and it’s much easier to do in Power Query.
Once you start to use Power Query you may find yourself with quite a few queries in the one file. To make it easier to control them you can use groups to keep similar queries together.
In October 2019 I ran my Introduction to Power Query webinar for free (previously it was a paid session). I want to get this information out to as many people as possible. please share this resource with colleagues and your network.
The detailed pdf manual and example file can be downloaded by using the button below. Content listed below the video.
Power Query allows you to automatically perform data cleansing routines on your data sources – no manual intervention required. Simply refresh and your data is ready to use. You can use csv files; txt files; databases and existing Excel tables as your data sources. Learn the basics, plus an advanced technique to automate data cleansing routines on your data sources.
CPD note – if you are claiming CPD for watching this recording you need to keep your own records. People who attend the live sessions receive an annual listing of attendances.
This session covers
- fixing dates so that Excel can recognise them
- formatting columns as text – retaining leading zeroes in CSV files
- deleting unwanted rows and columns from your data
- removing leading and trailing spaces
- populating blank values with zeroes
- populating blanks with entries from above
- correcting trailing minus signs
- unpivot a report – how to convert a report layout into a data table layout
- converting a MYOB report into a data table
Promoting headers in Power Query means using the first row as column headers. In Power Query this is a useful and common option. In some cases it is even automated. There is one time though when you don’t want to use it.
Sometimes when working with CSV files in Power Query you may strike the situation where Fill Down doesn’t fill down. Don’t worry there is an easy fix.
Power Query can easily combine data from multiple Excel files. A problem can arise if one or more of the files is open. Power Query will generate an error and the import will fail. The solution involves an old school Excel feature.
Let’s assume you have three state codes and four department codes and you want to create a table of all the possible 12 combinations (3 x 4). How do you do it so that it is flexible? i.e. if you add a new state or department it must be easy to update the combination table.
There are a couple of techniques to automate a unique list of items in Excel. I have covered them in previous blog posts (see links below). I thought I would describe how to use Power Query to create a dynamic unique list.
I have run two introductory webinars in 2016 on these two topics. You may need to download them and install them before the webinars so you can use them during the webinars. The Add-ins are free from Microsoft.