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In short, they do not. Relating tables in a database defines the relationships between the data sets in the different tables and allows the data to be accessed more efficiently, but it does not affect the accuracy of the data entered.
Graphical data: A method of delivering information; using a picture, or graphic, to display or communicate information or intent.
A pictogram
It is a graphical representation of a collection of data.
Graphs and graphical displays of many different kinds. To see a sample of some of these search images.google.com for graphical representation of data.