Unclean data can cause a lot of problems in Excel. In this post I will show how you can join data from different columns with a comma between them. That’s the easy part. The problem occurs when you have empty cells in your data, like in the table below. The result of the first row looks fine, but if you look at the rows with empty cells, you get too many commas:
How can we calculate the grades (for example A-F) in Excel if we have the test results as numbers? In the example below, a score of 90% or higher is an A, 80-89% is a B, 70-79% is a C, 65-69% is a D and less than 65% is an F.
The first thing we should do is to organize this information in a lookup table:
The picture to the right shows a table with some sales figures for July. There’s nothing wrong with the table as it is, but I find it very hard to read and make sense of it. There are just a lot of numbers and dates, and you can’t even distinguish between weekdays and weekends. If we could highlight the weekends (or weekdays) it would be a lot easier to read these numbers. In this example I want to highlight the Saturdays and Sundays. Here’s how we’ll do it:
If you want to find a value in a table in Excel, a simple VLOOKUP function is usually a good and easy way to do it. But you have to be careful – if you insert a new column in your table, the function might not work anymore, and we have to find another approach. Here’s why: