COUNT over two tables - Dev Articles

General SQL Development

User Name:

Password:

Remember me

Dev Articles Community Forums Sponsor:

Stay one step ahead of the competition. Evaluate and give feedback on some of the hottest web development tools on the market today. Make your opinion heard! Click Here

December 22nd, 2002, 04:00 PM

hick.hack

Junior Member

Join Date: Dec 2002

Posts: 3

Time spent in forums: < 1 sec
Reputation Power: 0

COUNT over two tables

Hi,

I want to count over two tables like this

Code:

SELECT COUNT(table1.id), COUNT(table2.id) FROM table1, table2

but I got a wrong result.
What is wrong?

thanks for your help

cu hick.hack

December 22nd, 2002, 05:44 PM

Ben Rowe

Guest

Posts: n/a
Time spent in forums:
Reputation Power:

SELECT COUNT(*) FROM table1, table2

try that, because you have two table, you will only have 1 count.

December 23rd, 2002, 12:49 AM

hick.hack

Junior Member

Join Date: Dec 2002

Posts: 3

Time spent in forums: < 1 sec
Reputation Power: 0

sorry, but this is not what I want.

I will with one SELECT two different results one from every table.
Not a COUNT over both tables.

thanks for your time.

hick.hack

December 23rd, 2002, 12:54 AM

hick.hack

Junior Member

Join Date: Dec 2002

Posts: 3

Time spent in forums: < 1 sec
Reputation Power: 0

hi, thanks all for your help.

I solve the problem.
This is the code that I want

Code:

SELECT COUNT(DISTINCT tabelle1.id) AS tbl1_length, 
COUNT(DISTINCT tabelle2.id) AS tbl2_length FROM tabelle1, tabelle2

cu hick.hack

March 3rd, 2008, 05:02 AM

tamanti

Registered User

Join Date: Mar 2008

Posts: 1

Time spent in forums: 18 m 43 sec
Reputation Power: 0

COUNT over two tables

Quote:

Originally Posted by hick.hack

Code:

SELECT COUNT(DISTINCT tabelle1.id) AS tbl1_length, 
COUNT(DISTINCT tabelle2.id) AS tbl2_length FROM tabelle1, tabelle2

Be careful! If the tables have many records this could result in an heavy query.

In an oracle environment I got better performance with:

Code:

select (select count(*) from table1) - (select count(*) from table2) from dual;

Viewing: Dev Articles Community Forums > Databases > General SQL Development > COUNT over two tables

« Previous Thread | Next Thread »

Thread Tools	Search this Thread
Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts vB code is On Smilies are On [IMG] code is On HTML code is Off

View Your Warnings | New Posts | Latest News | Latest Threads | Shoutbox

Forum Jump

Free IT White Papers!

Accelerating Trading Partner Performance
One in five. That's how many partner transactions have at least one error. That is an amazing statistic, particularly given the extraordinary leaps in innovation across the global supply chain during the past two decades. Download this white paper to learn more.

Competing on Analytics
This Tech Analysis is designed to help identify characteristics shared by analytics competitors, and includes information about 32 organizations that have made a commitment to quantitative, fact-based analysis.

Cost Effective Scaling with Virtualization and Coyote Point Systems
An overview of the industry trend toward virtualization, how server consolidation has increased the importance of application uptime and the steps being taken to integrate load balancing technology with virtualized servers.

Five Checkpoints to Implementing IP Telephony
Implementation planning for IP PBX software and IP telephony has become vital as businesses replace discontinued legacy PBX phone systems. This informative whitepaper outlines five "checkpoints" for any implementation plan that will help make IP communications a successful proposition.

Hosted Email Security: Staying Ahead of New Threats
In the last two years, email has become a fierce battleground between the nefarious forces of spam and malware, and the heroes of messaging protection. The spam volumes increased alarmingly every month, bringing clever new forms of phishing and virus propagation attacks.

More Free IT White Papers!