remove duplicate entries - by: jelo

itsme wrote: I thought could be something on database level or other solution or workaround you may have...

This kind of duplication check is unusual for survey tools. More common in mailing tools (token list in Limesurvey has some kind of duplication check). I'm not aware of any out of the box solution for responses. The manual solution is to sort responses and check via eyes. Best approach is exporting data and use a third party tool (e.g. spreadsheet) to apply search/check routines.