You may need to prepare messy data for an ad hoc analysis, or you might need to periodically prepare and circulate reports for large audiences. The simple techniques that you will learn here will significantly reduce your data preparation time and enable you to tackle bigger challenges more quickly. If you are new to Power Query, this chapter is the key to achieving a lot as a data analyst. These techniques will enable you to prepare your data in a matter of minutes. In this chapter, you will learn a wide variety of techniques in the Power Query Editor in Excel and Power BI for cleaning badly formatted datasets. But in many cases, data analysts eventually abandoned their exploration of messy datasets, uncertain of the return on investment they would get from cleaning the badly formatted data. Those who knew programming languages such as Python and R could harness their power to aid in the cleansing effort. Excel power users could also use advanced formulas and VBA to clean and prepare data. In the past, analysts needed to tackle badly formatted data with painful manual cleansing efforts. Working with messy datasets can consume a lot of time for a data analyst. Split delimiter-separated values into rows to define group/member associations Learn how to avoid refresh failures when a lookup table contains duplicate values, even when you are sure you removed them Split a table into a fact table and a lookup table by using the Reference and Remove Duplicates commands Learn how to extract date or time elements from Date columns Handle inconsistent date values from one or more locales Learn how to extract meaningful information, such as hyperlinks, from text columns Learn how Add Column from Examples can help you extract or compute meaningful data from columns and use it to explore new transformations Learn how to enrich your data from lookup tables in a single table or by using relationships between fact tables and lookup tables Learn how to split and extract valuable information from delimiter-separated values Before anything else, preparation is the key to success.
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