UPDATE in wordpress mysql code example

Example 1: update wordpress query

$wpdb->query($wpdb->prepare("UPDATE $table_name SET time=$current_timestamp WHERE userid=$userid"));

Example 2: update wordpress query

$execut= $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->users SET user_nicename = %d WHERE ID = %s", "Harde_Bande", 546 ) );
var_dump($execut);