I am querying for duplication of column name in the web using REST query. My query is as per below:
http://siteCollection/sites/Project1/_api/Web/Fields?$select=InternalName&$filter=toupper(InternalName) eq 'TITLE'.
The reference I got from this site. But whenever I am running the same query in the REST Client I am getting following error:
The function operator 'toupper' is not supported or its usage is invalid.
What am I missing in my query? Or this is not a way for doing the case insensitive query then which way is preferable?