diff --git a/db/db.code.version.txt b/db/db.code.version.txt
index 0ddd619..dc6f4a8 100644
--- a/db/db.code.version.txt
+++ b/db/db.code.version.txt
@@ -1 +1 @@
-217
+218
diff --git a/db/db.update.218.php b/db/db.update.218.php
new file mode 100644
index 0000000..f16e716
--- /dev/null
+++ b/db/db.update.218.php
@@ -0,0 +1,32 @@
+<?
+function db_update_218_pre() 
+{
+}
+
+function db_update_218_post()
+{
+	$tables=array(
+		'questions',
+		'fairs_stats'
+	);
+
+	// add the conferences_id field
+	foreach($tables as $tableName){
+		$query = "ALTER TABLE `$tableName` ADD `conferences_id` INT NOT NULL";
+		mysql_query($query);
+		echo $query . ";\n";
+	}
+
+	// get the year => conference_id links
+	$q1 = mysql_query("SELECT year, id FROM conferences WHERE year > 0");
+
+	// add the conferences_id field to each table
+	while($r = mysql_fetch_assoc($q1)){
+		foreach($tables as $tableName){
+			$query = "UPDATE `$tableName` SET `conferences_id` = {$r['id']} WHERE `year` = {$r['year']}";
+			mysql_query($query);
+			echo $query . ";\n";
+		}
+	}
+}
+?>