basically in qlikview there are no data types, however you can format the fields or convert them into specific data types (but still even after that they can have any data type). to override a data type, you can go to document properties and then tables.
There are no data types in QlikView:
There are different presentation of the numeric data, that's it. But you can't even say that a given column is a numeric or a text, because both numeric and string values can be in the same column in QlikView.
I had a problem when I read a field from a SQL table with a "bit" data type. This field contained 0 and 1 values in the DB but in QV the values were 0 and -1. I had to convert the Data Type to "int" using a SQL CAST statement in order to get the correct values. This took a long time for me to find what the issue was and I just wanted to know if there is an easy way to find all the fields with the "bit" data type in my data model without having to check on the source DB.