join two tables, error 1054 unknown column in 'on clause'

Question

I am trying to join two tables by userid. I tried this:

select *
from crm_public.crm_user
join crm_sare.nl_user u on v.userid=u.userid
;

Unfortunately error occurs: Error Code: 1054. Unknown column 'v.userid' in 'on clause'

What did I do wrong? Thanks for your help.

Answer 1

try assing the alias and be sure of the correct column name

select *
from crm_public.crm_user as v
join crm_sare.nl_user as u on v.userid=u.userid
;