Question

<?php
    $query = 'SELECT id FROM transaction_table';
    $result = db_query($query);  
    while($row = db_fetch_array($result)) {    
        //do some processing
        db_query('UPDATE transaction_table SET updated = "1" WHERE id = "%s"',$row['id']);
    }
?>

Every time this script run, it only updates a few random rows (8-25 on average). It should be updating all the rows.

Answer 1

echo out the query on each loop. My guess is that there are a few that error out. Use this code:

<?php
    $query = 'SELECT id FROM transaction_table';
    $result = db_query($query);  
    while($row = db_fetch_array($result)) {    
        //do some processing
        echo 'UPDATE transaction_table SET updated = "1" WHERE id = "'.$row['id'].'"<br>';
        db_query('UPDATE transaction_table SET updated = "1" WHERE id = "%s"',$row['id']);
    }
?>

Try running each query manually in MySQL directly and verify each will run. I can’t see anything in the code you gave us that would cause any issues.