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Searching specifically for year in date field

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Hi all,


I have a search page where I'd like members to be able to search for races that they and their friends have entered into a database. When entering the data, users put the race date into the race_date field (Which is a DATETIME field) in the table.


I've set up the search and display pages, so users can search by a number of other criteria (first name, last name, race distance, time, etc), but am having trouble with searching by year. On my search form, is a field called race_year.


So, obviously I need some change in the code below, specifically in relation to the line $where .= " AND race_date='$race_year'"; because I want to extract the year part of the race_date column from the table and see if it matches $race_year .


Any advice would be appreciated.





$race_year = $_POST['race_year'];
if ($race_year != '')
{ // A year is selected
  $where .= " AND race_date='$race_year'";


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I've wondered about this for a while but never had the chance to test it:


Would a BETWEEN be more efficient?

...race_date BETWEEN '$race_year-01-01' AND '$race_year-12-31'
...race_date BETWEEN '$race_year-01-01 00:00:00' AND '$race_year-12-31 23:59:59'
Or is MySQL smart enough to do that optimization (or something else) by itself?
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requinix, I hate to say this but you win :happy-04:


I too became curious so I set up a benchmark with and without an index on the date field

/******* THE TABLE **********************************
        CREATE TABLE `dates` (
          `thedate` date NOT NULL DEFAULT '0000-00-00',
          `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
          PRIMARY KEY (`id`),
          KEY `idx_date` (`thedate`)

$years = range(1986,2014);
$days = range(1,365);

/**** CREATE 10,000+ recs in random order ************

        $sql = "INSERT INTO dates (thedate)
                VALUES (STR_TO_DATE(?, '%Y %j'))";
        $stmt = $db->prepare($sql) or die($db->error);
        $stmt->bind_param('s', $date);

        foreach ($days as $d) {
            foreach ($years as $y) {
                $date = "$y $d";



$t1 = microtime(1);
foreach ($years as $y) {
    $sql = "SELECT * 
            FROM dates 
            WHERE YEAR(thedate) = $y";
$t2 = microtime(1);
foreach ($years as $y) {
    $sql = "SELECT * 
            FROM dates 
            WHERE thedate BETWEEN '{$y}-01-01' AND '{$y}-12-31'";
$t3 = microtime(1);

echo "<h3>Result</h3><pre>";
printf ("YEAR()  : %8.4f\n", $t2-$t1);
printf ("BETWEEN : %8.4f\n", $t3-$t2);

The results were

with index on thedate

YEAR()  :   0.1619
BETWEEN :   0.0276

without index

YEAR()  :   0.1740
BETWEEN :   0.1659
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