SQL - NOT IN

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

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Somehow its not giving the right results
Star79Asked:
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Jim HornConnect With a Mentor Microsoft SQL Server Developer, Architect, and AuthorCommented:
>find all the rono which are in Rxs table but not present in Rxadmin table.
SELECT r.rono, r.patid
FROM rxs r
-- The LEFT JOIN ensures that all rxs rows are in the return set
LEFT JOIN Rxadmin ra ON r.rono = ra.rono  
-- And then limits the return set to only those with no Rxadmin match
   WHERE ra.rono IS NULL

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>where not rxno in
Not sure if it matters, but in the above T-SQL try where Rxs.rxno NOT IN
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guswebbCommented:
select * from rxs where not rxno in (select rxno from rxadmin)
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Shaun KlineLead Software EngineerCommented:
Your query is syntactically correct. Are you missing rows in your results or do you have extra rows?
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guswebbCommented:
sorry, that should have been...

select * from rxs where not rono in (select rono from rxadmin)
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Star79Author Commented:
my query is missing rows
I also tried
select * from rxs where not rono in (select rono from rxadmin)
still missing rows
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Shaun KlineLead Software EngineerCommented:
Try this:
SELECT rono,patid
FROM   [rx].[dbo].[rxs] rxs
WHERE  NOT EXISTS (SELECT 1
                             FROM   [rx].[dbo].[rxadmintimes]
                             WHERE  rxs.rono = rono
                             AND rxs.rxno = rxno) 
ORDER BY rxs.RoNo

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This SQL assumes that RXNo is a linking field between the two tables along with rono.

The NOT EXISTS is considered more efficient that using a NOT IN query.
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