Rename field
                This script function renames one or more existing Qlik Sense field(s) after they have been loaded.
Information noteIt is not recommended to  name a variable identically to a field or a function in Qlik Sense.
                Either syntax: rename field or rename fields can be used.
Syntax:
Rename Field (using mapname | oldname to newname{ , oldname to newname })
Rename Fields (using mapname | oldname to newname{ , oldname to newname })
Arguments:
| Argument | Description | 
|---|---|
| mapname | The name of a previously loaded mapping table containing one or more pairs of old and new field names. | 
| oldname | The old field name. | 
| newname | The new field name. | 
Limitations:
You cannot rename two fields to having the same name.
Example 1:
Rename Field XAZ0007 to Sales;
Example 2:
FieldMap:
Mapping SQL SELECT oldnames, newnames from datadictionary;
Rename Fields using FieldMap;