TypeDefinition :: viewFrom - FROM expression
The function returns a string containing the FROM expression as being defined in a view definition or SELECT statement. In case of errors or invalid type definition, the function throws an exception.
Implementation details
When the type definition is a valid view definition, the function returns a string containing the FROM expressionThe FROM expression returned contains the maximum of information including data type definition and member names. In a user defined definition or script this could be shortened.
When no FROM clause been defined for the view, an empty string is returned.
When calling the function with an invalid type definition or when the type definition does not refer to an view type, the function throws an exception. In order to check, whether the data type is a view type, isView() might be called.