Niphlod, can you please explain why you're using method _select instead of select in your code below? In there no need to connect to SQL to set all_courses?
On Tuesday, September 24, 2013 3:35:34 PM UTC+2, Niphlod wrote: > > you can do that with > > all_courses = db(db.courses.id>0)._select(db.courses.memberid) > all_members_not_in_courses = db(~db.members.id.belongs(all_courses)) > > you can eventually throw in a distinct on db.courses.memberid if the > number of courses rows is plenty. > > Il giorno martedì 24 settembre 2013 12:16:52 UTC+2, Michael Hall ha > scritto: >> >> I am not the most awesome SQL person and as such I am having trouble >> constructing a query I need. >> >> I have two tables in a database called "old". The parent table is called >> "members" and there is a child table called "courses". >> >> #-------- >> old.define_table('members', >> Field('id'), >> Field('profile_id','string'), >> Field('title','string'), >> Field('firstname','string'), >> Field('surname','string'), >> Field('memberlevel','string'), >> Field('lawfirm','string'), >> Field('registerdate','date'), >> Field('expirydate','date'), >> Field('email','string'), >> Field('telno','string'), >> Field('address1','string'), >> Field('address2','string'), >> Field('address3','string'), >> Field('town','string'), >> Field('county','string'), >> Field('postcode','string'), >> Field('country','string'), >> Field('notes','text'), >> Field('memberstatus','string'), >> migrate=False) >> >> old.define_table('courses', >> Field('memberid',type='reference members',), >> Field('profile_id','string'), >> Field('course','string'), >> Field('enroldate','string'), >> migrate=False) >> >> I would like to select all records in the members table that are not >> referenced by records in the courses table. I suppose it could be described >> as the opposite of a join as I only want to select members that do not have >> courses attached to them. >> >> Any help would be appreciated. >> >> >> -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.