Although Tableau can analyze databases, you don't need to know anything about databases to USE Tableau. You don't need Tableau. Indeed, Tableau is intended to enable entrepreneurs with no technical training to effectively analyze their information. 

Tableau has three easy concepts: 

• Connect the Tableau- Connect it to any database you want to evaluate. Note that the data is not imported by Tableau. Rather, it straight queries the database. 
• Analyze- ANALYZING information is viewed, filtered, sorted, CALCULATED, reorganized, summarized and so forth. It implies analyzing information. By placing areas of the information source on the Tableau worksheets you can do all these things using Tableau. Tableau DISPLAYS information in conventional controllers and query languages (such as SQL and MDX) and displays a visual assessment of the information when you drop a field on a worksheet. 
• Share- By exchanging workbooks with other Tableaux users, adding outcomes into apps, such as Microsoft Office, PRINTING in PDF or using Tableau Server to publish or integrate your opinions across your organisation you can share your outcomes with others.