Re: SQL View export to excel, changed number formats
The dates from the latest excel file look like proper dates. The earlier ones look like text strings. If your sources change their date formats that's not a problem Qlikview caused. But you most likele can handle the issue in Qlikview by using the alt function: date(alt(MyExcelDate,date#(MyExcelDate,'DD-MM-YYYY'),'DD-MM-YYYY') as MyDate.
The special characters like ë is something you should take care of in the source. If your excel file is really an excel file (and not a csv file masquerading as an excel file with a bogus .xls suffix) then the text values from the source database were not correctly extracted. It looks like unicode strings were exported as ascii strings.