I am an azure newbie who has a mongodb database on Azure cloud storage. I am trying to delete a row with a specific value from the Query explorer in Azure, but I keep getting this error. Am I missing something?

delete from users where _id='...' doesnt work neither does delete * from users where _id='' work
this works perfectly even if am doing SQL on a mongodb database while querying

deletein small letters (it's not marked as a keyword in the explorer)? Just guessing at this point, don't know how Azure actually translates the queries. - Erik