A picture is worth a thousand words

The term data visualization describes the representation of data sets in a graphical form. A complex idea can often be displayed as an image. This allows clearer communication of data in forms of data visualization tools. An example of tools

• dashboards (performance dashboard),

• scorecards,

• charts, dials, maps, graphs etc.
  

SQL tools which can help visualizing data

SQL Director for Dependencies & Indexes

Graphical Database Schema Metadata Browser
A GUI for SchemaSpy (Graphical Database Schema Metadata Browser)

Systems thinking uses diagrams to express complex ideas, emergence and the chaotic universe.