Posted on 2013-11-27
Medium Priority
Last Modified: 2013-11-27
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

Open in new window

Somehow its not giving the right results
Question by:Star79
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Expert Comment

ID: 39680654
select * from rxs where not rxno in (select rxno from rxadmin)
LVL 26

Expert Comment

by:Shaun Kline
ID: 39680677
Your query is syntactically correct. Are you missing rows in your results or do you have extra rows?

Expert Comment

ID: 39680722
sorry, that should have been...

select * from rxs where not rono in (select rono from rxadmin)
Get free NFR key for Veeam Availability Suite 9.5

Veeam is happy to provide a free NFR license (1 year, 2 sockets) to all certified IT Pros. The license allows for the non-production use of Veeam Availability Suite v9.5 in your home lab, without any feature limitations. It works for both VMware and Hyper-V environments


Author Comment

ID: 39680919
my query is missing rows
I also tried
select * from rxs where not rono in (select rono from rxadmin)
still missing rows
LVL 66

Accepted Solution

Jim Horn earned 2000 total points
ID: 39680933
>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

Open in new window

>where not rxno in
Not sure if it matters, but in the above T-SQL try where Rxs.rxno NOT IN
LVL 26

Expert Comment

by:Shaun Kline
ID: 39680934
Try this:
SELECT rono,patid
FROM   [rx].[dbo].[rxs] rxs
                             FROM   [rx].[dbo].[rxadmintimes]
                             WHERE  rxs.rono = rono
                             AND rxs.rxno = rxno) 

Open in new window

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.

Featured Post

Ransomware-A Revenue Bonanza for Service Providers

Ransomware – malware that gets on your customers’ computers, encrypts their data, and extorts a hefty ransom for the decryption keys – is a surging new threat.  The purpose of this eBook is to educate the reader about ransomware attacks.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

After restoring a Microsoft SQL Server database (.bak) from backup or attaching .mdf file, you may run into "Error '15023' User or role already exists in the current database" when you use the "User Mapping" SQL Management Studio functionality to al…
In this article we will get to know that how can we recover deleted data if it happens accidently. We really can recover deleted rows if we know the time when data is deleted by using the transaction log.
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question