I'm new to hive trino. I would like to concatenate three text columns with "_" as separator. So I wrote following code select A.*,B.Name_group,mail_group,Occupation_group,CONCAT_WS("_",mail_group,Occupation_group,Name_group) combined_error from hive.employee.Job A left join hive.employee.Name B on A.Name_id=B.Name_id left join hive.employee.mail C on A.mail_id= C.mail_id left join hive.employee.Occupation D on A.Occupation_id=D.Occupation_id   But I got following error message Colum '_' cannot be resolved. Can you help me to fix the issue ... View more