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Are Data are always numerical measurements.?
No. Data can mean any information, text, graphics or numeric that has t be stored, used , reported on , investigated or used for reasearch
What is the difference between numeric and non-numeric keys in RDBMS?
Numeric means a number is used. For a key, that would usually be an integer. Non-numeric keys can include any symbols (i.e., text). In theory, you could also use other specialized data types, for example, dates. Check the data types available by a specific RDBMS; details may vary. Almost any data type can be used for a key; although variable-length data types such as BLOB are either not supported or not practical to use.
What is numeric data used for?
For recording information using numbers.
Is Chart a visual display of numeric data?
Yes, a chart can be used to display numerical data.
What is evaluation of an expression?
It means to do the required calculations, in order to get a single number as a result. (Or some other data type, which is not numeric - in computer science, date expressions and text expressions are also used, among other things.)
