Cypher query '_'

Hello everyone!

on the Cypher query below, what does adding " '_' " do? as I go over the tutorials I see them often from solutions. Also, is it recommended to use that as we query? Please let me know! thanks in advance.

MERGE (originAirportDay:AirportDay
{airportDayId: origin.code + '_' +})

Hello @plee :slight_smile:

I think they use _ to build the airportDayId, for example: 155_20200624 is an airportDayId :slight_smile:

Moreover, it's recommanded to use _ as you can see here in the documentation for the relationship type but you can still use it in properties values :slight_smile: