Solved

How do I "add" 2 select count(*) statements?

Posted on 2006-06-11
5
548 Views
Last Modified: 2008-03-10
How do I execute a statement like this:

SELECT COUNT(*) FROM [User].Users + SELECT COUNT(*) FROM [Survey].Users

The idea being that it adds the number of users in schema user and the number of users in schema survey and returns the sum

Another example of what might be executed without involving schemas:
SELECT COUNT(*) FROM ClassApplications + SELECT COUNT(*) FROM CourseApplications


Note that these statements do not execute (syntax error).  My question is: How would I word the above statements to get the behavior I'm looking for?
0
Comment
Question by:stev0931
  • 2
  • 2
5 Comments
 
LVL 65

Assisted Solution

by:Jim Horn
Jim Horn earned 150 total points
ID: 16881346
I'm sure there is a more elegant/correct way to do this, but this worked in my Query Analyzer

Select a.FirstTable + b.SecondTable
FROM
(SELECT COUNT(User.Users) as FirstTable FROM User) a
CROSS JOIN
(SELECT COUNT(Survey.Users) as SecondTable FROM Survey) b
0
 

Author Comment

by:stev0931
ID: 16881358
Thanks!  I'm assuming the CROSS JOIN is joining 2 scalars?  And, thus, there will be a negligible impact on performance, even with thousands or millions of records per table?
0
 
LVL 65

Assisted Solution

by:Jim Horn
Jim Horn earned 150 total points
ID: 16881377
You'd have to test, as I'm not sure, although my guess is if you join the two tables in any other way, the join type may affect the counts returned.
0
 
LVL 5

Accepted Solution

by:
rmacfadyen earned 150 total points
ID: 16881386
select
   (select count(*) from TableA) + (select count(*) from TableB) as Total

Regards,

Rob
0
 

Author Comment

by:stev0931
ID: 16881400
Thanks!
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

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

Suggested Solutions

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.
I have a large data set and a SSIS package. How can I load this file in multi threading?
Via a live example, show how to backup a database, simulate a failure backup the tail of the database transaction log and perform the restore.
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.

948 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

Need Help in Real-Time?

Connect with top rated Experts

24 Experts available now in Live!

Get 1:1 Help Now