diff --git a/src/DatabaseImporter.php b/src/DatabaseImporter.php
index 21dd3e4ff..dc0d17441 100644
--- a/src/DatabaseImporter.php
+++ b/src/DatabaseImporter.php
@@ -119,6 +119,41 @@ public function from($from)
 		return $this;
 	}
 
+	/**
+	 * Get the SQL syntax to add a column.
+	 *
+	 * @param   string             $table  The table name.
+	 * @param   \SimpleXMLElement  $field  The XML field definition.
+	 *
+	 * @return  string
+	 *
+	 * @since   1.0
+	 */
+	protected function getAddColumnSQL($table, \SimpleXMLElement $field)
+	{
+		$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' ADD COLUMN ' . $this->getColumnSQL($field);
+
+		return $sql;
+	}
+
+	/**
+	 * Get the syntax to alter a column.
+	 *
+	 * @param   string             $table  The name of the database table to alter.
+	 * @param   \SimpleXMLElement  $field  The XML definition for the field.
+	 *
+	 * @return  string
+	 *
+	 * @since   1.0
+	 */
+	protected function getChangeColumnSQL($table, \SimpleXMLElement $field)
+	{
+		$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' CHANGE COLUMN ' . $this->db->quoteName((string) $field['Field']) . ' '
+			. $this->getColumnSQL($field);
+
+		return $sql;
+	}
+
 	/**
 	 * Get the SQL syntax to drop a column.
 	 *
@@ -136,6 +171,42 @@ protected function getDropColumnSQL($table, $name)
 		return $sql;
 	}
 
+	/**
+	 * Get the details list of keys for a table.
+	 *
+	 * @param   array  $keys  An array of objects that comprise the keys for the table.
+	 *
+	 * @return  array  The lookup array. array({key name} => array(object, ...))
+	 *
+	 * @since   1.0
+	 */
+	protected function getKeyLookup($keys)
+	{
+		// First pass, create a lookup of the keys.
+		$lookup = array();
+
+		foreach ($keys as $key)
+		{
+			if ($key instanceof \SimpleXMLElement)
+			{
+				$kName = (string) $key['Key_name'];
+			}
+			else
+			{
+				$kName = $key->Key_name;
+			}
+
+			if (empty($lookup[$kName]))
+			{
+				$lookup[$kName] = array();
+			}
+
+			$lookup[$kName][] = $key;
+		}
+
+		return $lookup;
+	}
+
 	/**
 	 * Get the real name of the table, converting the prefix wildcard string if present.
 	 *
diff --git a/src/Mysql/MysqlImporter.php b/src/Mysql/MysqlImporter.php
index c03aa652f..e64598814 100644
--- a/src/Mysql/MysqlImporter.php
+++ b/src/Mysql/MysqlImporter.php
@@ -17,23 +17,6 @@
  */
 class MysqlImporter extends DatabaseImporter
 {
-	/**
-	 * Get the SQL syntax to add a column.
-	 *
-	 * @param   string             $table  The table name.
-	 * @param   \SimpleXMLElement  $field  The XML field definition.
-	 *
-	 * @return  string
-	 *
-	 * @since   1.0
-	 */
-	protected function getAddColumnSQL($table, \SimpleXMLElement $field)
-	{
-		$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' ADD COLUMN ' . $this->getColumnSQL($field);
-
-		return $sql;
-	}
-
 	/**
 	 * Get the SQL syntax to add a key.
 	 *
@@ -275,23 +258,6 @@ protected function getColumnSQL(\SimpleXMLElement $field)
 		return $sql;
 	}
 
-	/**
-	 * Get the SQL syntax to drop a column.
-	 *
-	 * @param   string  $table  The table name.
-	 * @param   string  $name   The name of the field to drop.
-	 *
-	 * @return  string
-	 *
-	 * @since   1.0
-	 */
-	protected function getDropColumnSQL($table, $name)
-	{
-		$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' DROP COLUMN ' . $this->db->quoteName($name);
-
-		return $sql;
-	}
-
 	/**
 	 * Get the SQL syntax to drop a key.
 	 *
diff --git a/src/Mysqli/MysqliImporter.php b/src/Mysqli/MysqliImporter.php
index 8bee16cd1..82698e199 100644
--- a/src/Mysqli/MysqliImporter.php
+++ b/src/Mysqli/MysqliImporter.php
@@ -42,23 +42,6 @@ public function check()
 		return $this;
 	}
 
-	/**
-	 * Get the SQL syntax to add a column.
-	 *
-	 * @param   string             $table  The table name.
-	 * @param   \SimpleXMLElement  $field  The XML field definition.
-	 *
-	 * @return  string
-	 *
-	 * @since   1.0
-	 */
-	protected function getAddColumnSQL($table, \SimpleXMLElement $field)
-	{
-		$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' ADD COLUMN ' . $this->getColumnSQL($field);
-
-		return $sql;
-	}
-
 	/**
 	 * Get the SQL syntax to add a key.
 	 *
diff --git a/src/Postgresql/PostgresqlImporter.php b/src/Postgresql/PostgresqlImporter.php
index f99a6eba6..f211ad941 100644
--- a/src/Postgresql/PostgresqlImporter.php
+++ b/src/Postgresql/PostgresqlImporter.php
@@ -42,23 +42,6 @@ public function check()
 		return $this;
 	}
 
-	/**
-	 * Get the SQL syntax to add a column.
-	 *
-	 * @param   string             $table  The table name.
-	 * @param   \SimpleXMLElement  $field  The XML field definition.
-	 *
-	 * @return  string
-	 *
-	 * @since   1.0
-	 */
-	protected function getAddColumnSQL($table, \SimpleXMLElement $field)
-	{
-		$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' ADD COLUMN ' . $this->getColumnSQL($field);
-
-		return $sql;
-	}
-
 	/**
 	 * Get the SQL syntax to add an index.
 	 *
@@ -184,8 +167,8 @@ protected function getAlterTableSQL(\SimpleXMLElement $structure)
 
 		/* Index section */
 		// Get the lookups for the old and new keys
-		$oldLookup = $this->getIdxLookup($oldKeys);
-		$newLookup = $this->getIdxLookup($newKeys);
+		$oldLookup = $this->getKeyLookup($oldKeys);
+		$newLookup = $this->getKeyLookup($newKeys);
 
 		// Loop through each key in the new structure.
 		foreach ($newLookup as $name => $keys)
@@ -492,9 +475,23 @@ protected function getDropPrimaryKeySQL($table, $name)
 	 * @return  array  The lookup array. array({key name} => array(object, ...))
 	 *
 	 * @since   1.0
-	 * @throws  \Exception
+	 * @deprecated  2.0  Use {@link getKeyLookup()} instead
 	 */
 	protected function getIdxLookup($keys)
+	{
+		return $this->getKeyLookup($keys);
+	}
+
+	/**
+	 * Get the details list of keys for a table.
+	 *
+	 * @param   array  $keys  An array of objects that comprise the keys for the table.
+	 *
+	 * @return  array  The lookup array. array({key name} => array(object, ...))
+	 *
+	 * @since   __DEPLOY_VERSION__
+	 */
+	protected function getKeyLookup($keys)
 	{
 		// First pass, create a lookup of the keys.
 		$lookup = array();