Normally each and every time in tableau it is not possible to obtain the meaningful output from the existing data field .some times we need to create the new field in the tableau known as the calculated field.this calculated fields can be obtain by writing calculations this calculations contains data fields ,parameters,functions and optionally comments also as this calculated field are deriving from the existing data fields this calculated fields are also known as as derived fields.
note
one calculated field can be used inside the second calculated field without restrictions.
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