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Editorial Team
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Asked: 2026-06-15T06:31:02+00:00

I have two tables Invitations and Users , both table contain some emails. I

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I have two tables Invitations and Users, both table contain some emails.

I want to count those emails which are present in the Invitation table but not present in the Users table

Invitation 

InvitationID    Email
-------------------------------------
    1           test@test.com
    2           someone@example.com
    3           test12@test.com

Users

UserName                  IsActive
-------------------------------------
test@test.com             InActive
sample12@sample.com       Active
test12@test.com           InActive

I tried it like this 

SELECT  COUNT(*) FROM Invitations, Users                                     
where Invitations.Email <> Users.UserName

I want like this 

Count=1
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1 Answer

  1. Editorial Team

    You’re getting the wrong answer because you’re counting the wrong thing.

    Imagine two records, a and b in each table. a<>b and b<>a so you’ll get 2, not the 0 you’re expecting.

    Try this instead

    Select count(*) 
from Invitations
     left join Users                                     
     on Invitations.Email = Users.UserName
where Users.UserName is null
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