Solved

Find missing records in one table excluding cancelled items

Posted on 2016-08-25
4
50 Views
Last Modified: 2016-08-25
Hi, I need to find all entries in table Hotelogix which are not existing in table Reservations but excluding cancelled records in Reservations. I have tried the following statement:

SELECT HotelogixReservations.[Group Id], HotelogixReservations.[Guest Name]
FROM HotelogixReservations LEFT JOIN QueryFull ON Ltrim(Rtrim(HotelogixReservations.[Group ID])) = QueryFull.[Group Reservation No]
WHERE (((QueryFull.[Group Reservation No]) Is Null)) OR QueryFull.Cancel=TRUE;

This almost works but gives an error in the case where I have the same reservation in Reservations table twice (once as cancelled and once as an open one). Not sure how to exclude any cancelled records in reservation? Thank you for any help..
0
Comment
Question by:mpim
4 Comments
 
LVL 1

Accepted Solution

by:
rquaglia earned 500 total points
ID: 41770355
Hi!
looking at you question I suggest to try something like:
SELECT HotelogixReservations.[Group Id], HotelogixReservations.[Guest Name]
FROM HotelogixReservations
WHERE Ltrim(Rtrim(HotelogixReservations.[Group ID])) NOT IN (select [Group Reservation No] from QueryFull where Cancel<>TRUE);

Sorry, I can't try this but anyway I hope this helps.
0
 
LVL 40

Expert Comment

by:Sharath
ID: 41770457
Can you provide some sample data and expected result?
0
 
LVL 35

Expert Comment

by:PatHartman
ID: 41770612
The problem with your initial query is the criteria against the "right" table.  The subselect solves that problem.  However, if you are running the query in Access subselects are not well optimized so you could make a query that selects the "right" table and applies the criteria.  Then left join to that query.  Access would then apply the criteria to the "right" table PRIOR to performing the left join and that solves the problem.
1
 

Author Closing Comment

by:mpim
ID: 41770702
Great help! Thank you Michael
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Access 2016 - Labels prompt to print 4 30
IIF help, YN field 7 22
DCount Type Mismatch 2 21
SQL Query assistance 16 22
Overview: This article:       (a) explains one principle method to cross-reference invoice items in Quickbooks®       (b) explores the reasons one might need to cross-reference invoice items       (c) provides a sample process for creating a M…
This article explains how to reset the password of the sa account on a Microsoft SQL Server.  The steps in this article work in SQL 2005, 2008, 2008 R2, 2012, 2014 and 2016.
With Microsoft Access, learn how to start a database in different ways and produce different start-up actions allowing you to use a single database to perform multiple tasks. Specify a start-up form through options: Specify an Autoexec macro: Us…
Viewers will learn how to use the INSERT statement to insert data into their tables. It will also introduce the NULL statement, to show them what happens when no value is giving for any given column.

776 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