How to run mysql queries in wordpress

At some point in your WordPress development career you may be presented with the need to write some custom mysql queries.

Select Query

Single row fetching

$ures = $wpdb->get_row("SELECT * F ROM `custome_users` ORDER BY `id` DESC");
    $ures ->name;

Multiple rows fetching

$ures = $wpdb->get_results("SELECT * F ROM `custome_users` ORDER BY `id` DESC");					
foreach ($ures as $uresfet)
{
    $uresfet->name;
}

How to count total number of rows

 $ures = $wpdb->get_results("SELECT * F ROM `custome_users` ORDER BY `id` DESC");
 $rows=$wpdb->num_rows;

Delete Query

 $wpdb->query("DELETE F ROM custome_users where id='$deleteid'");

Update query

 $wpdb->query("UPDATE `sample_requests` SET `firstname` = '$firstname', `lastname` = '$lastname' WHERE `id` ='$id'");

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