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In this video tutorial, Melissa demonstrates a custom function created to address problem of the week number two, focusing on cleaning messy text data in two columns. She introduces the “clean text” function, which accepts one parameter, “my text,” and is designed to return a text value. To avoid errors caused by variables not returning text values, she mentions commenting out the return type declaration. Melissa explains how to view the results of a specific variable by referring to it by name in the function. She proceeds to demonstrate how to invoke this function by adding a custom column to the query, selecting the merged column, and executing the function.
