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[SOLVED] MySQL optimization question


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I have a script that is to search a DB for matching critera.  It works, but I think its running slower than it should be.


The first query I run is:

$query = "SELECT * FROM ".$table." ".$critera." ".$orderby; 

that works to get me all matching results.


My question is what is stored in that query.  If it matches say 5 (row a,b,c,d,e) and i want to use the results of rows a,b,c later down to populate the matching results.  Can i Do this with out requerying?

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You can do this:


$select = "a, b, c";

$query = "SELECT ". $select ." FROM ".$table." ".$critera." ".$orderby; 


So it doesn't include anything that you don't need. You can also use LIMIT to cut it down more.

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mysql_query ($query); contains all of the rows and columns in the query.


so if you do * and have 5 rows and 5 columns it will take all of them. If you only query 1 column it will only take that 1 column with 5 rows.

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$query = "SELECT 'ID' FROM ".$table." ".$critera." ".$orderby;


$result=mysql_query ($query); //Return ofthe Number of Matching Results


Didnt' work

but later on I say:

          $adid_array[$i] = $row['ID'];
  while( $row= mysql_fetch_array($result));


any idea?

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yeah i think you initially misunderstood me a,b,c are the actual rows i need out of the matching rows a-e so select a,b,c would not work but anyways its a big improvement for now.  It could use a second optimization, but for now and its current function its good.


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