The identifiers of elements (data sources, wrappers, views, and their fields, etc.) may be case-sensitive or not. This depends on how the elements are created.
By default, the [Unicode support]( https://community.denodo.com/docs/html/browse/8.0/vdp/administration/server_configuration/identifiers_charset/identifiers_charset#unicode-mode) is disabled, so any new element will be created with a “[Restricted]( https://community.denodo.com/docs/html/browse/8.0/vdp/administration/server_configuration/identifiers_charset/identifiers_charset#restricted-mode)” character set. When an element is created in this restricted mode, its identifier is case insensitive. For example, if your fieldname is “AccountNumber”, it will be created as accountnumber in the restricted mode.
However, if you have created view and its field name with case-sensitive (Unicode mode), then the name of fields should be surrounded by double quotes (“) while executing it using select statement. Otherwise you will get an error.
You can refer to the Knowledge base article [Unable to create users with the upper case](https://community.denodo.com/kb/view/document/Unable%20to%20create%20users%20with%20upper%20case?category=Operation) for more information.
Hope this helps!