Find customers who ordered in 2015 but not 2016

I have  a table called Passes1 that shows every ticket sale we have ever made.
I want to run a query on customers that bought a ticket in 2015 but have not bought yet in 2016

I have this query -
SELECT * FROM Passes1 as pa WHERE NOT EXISTS (Select * from Passes1 as pa1 WHERE pa.THID=pa1.THID AND pa1.Year = '2016') AND Year ='2015'

Where am I off?
BHUCAsked:
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Éric MoreauSenior .Net ConsultantCommented:
or you do a LEFT JOIN:

select *
from Passes1 as P2015
left join Passes as P2016
on P2016.Year = '2016'
and P2016.THID = P2015.THID
where P2015.Year = '2015'
and P2016.THID is null

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Olaf DoschkeSoftware DeveloperCommented:
Your code should run, but would list customers of 2015 with each ticket. If you only want customers then only pick out the DISTINCT custoemrid instead of * or group by customerid

Eg you could also query 

Select customerid from passes1 where Max(Year)=2015 group by customerid

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Bye, Olaf.

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Olaf DoschkeSoftware DeveloperCommented:
...more likely than a Year column you would have an orderdate column and would pick MAX(YEAR(orderdate)) = 2015

Bye, Olaf.
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Query Syntax

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