Real-world data is almost never analysis-ready. It arrives from multiple systems in inconsistent formats, with wrong data types, merged columns, duplicate rows, and mismatched naming conventions. Tableau Prep Builder is a dedicated ETL (Extract, Transform, Load) tool that lets you visually build data preparation flows — cleaning, reshaping, and combining data before it reaches Tableau Desktop. Mastering Prep makes you dramatically more self-sufficient as an analyst.
1-A 2-A 3-A 4-A | 5 step 6 distributions 7 = Reusable, visual, auditable pipeline before analysis 8 = Clean step - Group Values by spelling/pronunciation 9 = Wildcard union in the input step | 10 = Outliers, nulls, weird distributions instantly