troubleshooting Question

SQL - NOT IN

Avatar of Star79
Star79Flag for United States of America asked on
Microsoft SQL Server 2008
6 Comments1 Solution336 ViewsLast Modified:
Hello all,
I have the following tables:
Rxs has columns rxno,patid,rono,drug
Rxadmin has columns rxno,patid,rono,admintime.
How to write a query to find all the rono which are in Rxs table but not present in Rxadmin table.
I wrote the below sql
SELECT rono,patid
       
FROM   [rx].[dbo].[rxs] 
WHERE  rxs.rono NOT IN (SELECT rono
                             FROM   [rx].[dbo].[rxadmintimes]
                             WHERE  rono IS NOT NULL) 
                             order by rxs.RoNo
Somehow its not giving the right results
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