Question

I’m trying to do the following:

select i.FirstName, i.LastName, COUNT(1) from (
    select u.Id, uw.WidgetId from [DB].[dbo].[Widgets] w inner join
     UserWidgets uw on w.Id = uw.WidgetId inner join
     Users u on uw.UserId = u.Id
     where uw.WidgetId in ('29017318-FD89-4952-A3A2-8405BD5C5C44', 
                           'BDB7D25C-0794-4965-842D-E6D03A250418',
                          'CB4553AC-A47B-4AA6-9231-5C59C8F97655')
     group by u.Id, uw.WidgetId
     ) a
 inner join [Db2].[dbo].[Identities] i on a.Id = i.IdentityId
 group by i.LastName, i.FirstName
 order by i.LastName, i.FirstName

What I want is to ensure that the “In” statement requires that the User ONLY has those 3 Id’s. No more, no less.

What is the best way to do this?

Answer 1

Try:

select i.FirstName, i.LastName, COUNT(1) from (
    select u.Id, uw.WidgetId from [DB].[dbo].[Widgets] w inner join
     UserWidgets uw on w.Id = uw.WidgetId 
                    and uw.WidgetId in ('29017318-FD89-4952-A3A2-8405BD5C5C44', 
                           'BDB7D25C-0794-4965-842D-E6D03A250418',
                          'CB4553AC-A47B-4AA6-9231-5C59C8F97655')
     inner join Users u on uw.UserId = u.Id
     left join UserWidgets uw2 on uw2.userid = u.id
                    and uw2.WidgetId not in ('29017318-FD89-4952-A3A2-8405BD5C5C44', 
                           'BDB7D25C-0794-4965-842D-E6D03A250418',
                          'CB4553AC-A47B-4AA6-9231-5C59C8F97655')
     where uw2.widgetid is null
     group by u.Id, uw.WidgetId
     ) a
 inner join [Db2].[dbo].[Identities] i on a.Id = i.IdentityId
 group by i.LastName, i.FirstName
 having count(1) = 3
 order by i.LastName, i.FirstName