EDIT: If you are using Excel 2019 or Office 365 you can use the TEXTJOIN function to solve this problem. Click here for the new article:

How to Join Text from Several Cells in Excel using TEXTJOIN

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: