vb.org Archive - Simplying a few MySQL Queries

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- - Simplying a few MySQL Queries - Help Needed (https://vborg.vbsupport.ru/showthread.php?t=99337)

CommuneZoom

10-26-2005 03:33 AM

Simplying a few MySQL Queries - Help Needed

I have the following queries that, if possible, I need to simplify. I'd like to knock this down to as few queries as possible as I will need to call additional (probably 2 other items) from the same row.

I am just looking to get the number of rows matching each set, though I'd rather knock 4 queries down to 1-2 if there is another way to do so.

PHP Code:


		
			
$getpending = $db->query_read("SELECT * FROM son_customers WHERE ispending = '1'");

$totalpending = $db->num_rows($getpending);



$getactive = $db->query_read("SELECT * FROM son_customers WHERE ispending = '0'");

$totalactive = $db->num_rows($getactive);

Is there an alternative, of will I be stuck making 4 seperate calls?

Guest190829

10-26-2005 03:48 AM

Try the below, maybe it will work. I need to start coding php more, and stop with vb.net. I'm starting to forget stuff!

PHP Code:


		
			
 $getcustomers = $db->query_read("SELECT COUNT(*) FROM son_customers");

 WHILE ($result = $db->fetch_array($getcustomers))

{

    if ($result[ispending] == '0')

    {

        $totalpending = $totalpending + 1

    }

    else

    {

        $totalactive = $totalactive + 1

    }

}

CommuneZoom

10-26-2005 04:09 AM

Quote:

Originally Posted by Danny.VBT

Try the below, maybe it will work. I need to start coding php more, and stop with vb.net. I'm starting to forget stuff!

PHP Code:


		
			
 $getcustomers = $db->query_read("SELECT COUNT(*) FROM son_customers");

 WHILE ($result = $db->fetch_array($getcustomers))

{

    if ($result[ispending] == '0')

    {

        $totalpending = $totalpending + 1

    }

    else

    {

        $totalactive = $totalactive + 1

    }

}

Thanks for the reply, however, I need them both to be showing at the same time and not alternating.

As I need it to report the total for the entire table, the above will not work. I have 8 entries in the table and the above reports a blank for active and 1 for pending (when all 8 are pending).

Guest190829

10-26-2005 04:12 AM

Quote:

Originally Posted by CommuneZoom

Try it without the Count clause. So...

PHP Code:


		
			
 $getcustomers = $db->query_read("SELECT * FROM son_customers");

 WHILE ($result = $db->fetch_array($getcustomers))

{

    if ($result[ispending] == '0')

    {

        $totalpending = $totalpending + 1

    }

    else

    {

        $totalactive = $totalactive + 1

    }

}

Paul M

10-26-2005 06:02 AM

I think the logic may be backwards in that, totalactive should be when ispending = 0.

Try ;

PHP Code:


		
			
$getcustomers = $db->query_read("SELECT ispending FROM son_customers"); 

 WHILE ($result = $db->fetch_array($getcustomers)) 

{ 

    if ($result[ispending]) 

    { 

        $totalpending += 1 

    } 

    else 

    { 

        $totalactive += 1 

    } 

}

Marco van Herwaarden

10-26-2005 12:43 PM

PHP Code:


		
			
$getcustomers = $db->query_first("SELECT SUM(IF(ispending = 1, 1, 0)) as pending,  SUM(IF(ispending = 0, 1, 0)) as active FROM son_customers");

finished.

Guest190829

10-26-2005 04:53 PM

Can you explain this bit?

[sql]IF(ispending = 1, 1, 0)) [/sql]

I've never seen this before...

Marco van Herwaarden

10-26-2005 05:43 PM

if the value of ispending is '1', it will result in a value of 1, otherwise 0 (zero), if you then sum it, you will count 1 for each row that have ispending = 1.

By testing ispending = 0, you can reverse the count.

Paul M

10-26-2005 05:50 PM

Quote:

Originally Posted by MarcoH64

PHP Code:


		
			
$getcustomers = $db->query_first("SELECT SUM(IF(ispending = 1, 1, 0)) as pending,  SUM(IF(ispending = 0, 1, 0)) as active FROM son_customers");

finished.

Interesting question, is it quicker to use a more complicated SQL query, or a simpler query and a bit of PHP.

Marco van Herwaarden

10-26-2005 08:48 PM

That depends totally on the query. Since this one are simple embedded functions, not used in where/order by/join conditions, i would say the query is much faster then doing it in php.

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