diff --git a/framework/yii/redis/ActiveQuery.php b/framework/yii/redis/ActiveQuery.php
index bd597a1..2a693cf 100644
--- a/framework/yii/redis/ActiveQuery.php
+++ b/framework/yii/redis/ActiveQuery.php
@@ -56,11 +56,6 @@ class ActiveQuery extends \yii\base\Component
 	 */
 	public $with;
 	/**
-	 * @var string the name of the column by which query results should be indexed by.
-	 * This is only used when the query result is returned as an array when calling [[all()]].
-	 */
-	public $indexBy;
-	/**
 	 * @var boolean whether to return each record as an array. If false (default), an object
 	 * of [[modelClass]] will be created to represent each record.
 	 */
@@ -80,6 +75,18 @@ class ActiveQuery extends \yii\base\Component
 	 * If less than zero it means starting n elements from the end.
 	 */
 	public $offset;
+	/**
+	 * @var array how to sort the query results. This is used to construct the ORDER BY clause in a SQL statement.
+	 * The array keys are the columns to be sorted by, and the array values are the corresponding sort directions which
+	 * can be either [[Query::SORT_ASC]] or [[Query::SORT_DESC]]. The array may also contain [[Expression]] objects.
+	 * If that is the case, the expressions will be converted into strings without any change.
+	 */
+	public $orderBy;
+	/**
+	 * @var string the name of the column by which query results should be indexed by.
+	 * This is only used when the query result is returned as an array when calling [[all()]].
+	 */
+	public $indexBy;
 
 	/**
 	 * Executes query and returns all results as an array.
@@ -154,6 +161,21 @@ class ActiveQuery extends \yii\base\Component
 	}
 
 	/**
+	 * Executes the query and returns the first column of the result.
+	 * @param string $column name of the column to select
+	 * @return array the first column of the query result. An empty array is returned if the query results in nothing.
+	 */
+	public function column($column)
+	{
+		// TODO add support for indexBy and orderBy
+		$modelClass = $this->modelClass;
+		/** @var Connection $db */
+		$db = $modelClass::getDb();
+		$script = $db->luaScriptBuilder->buildColumn($this, $column);
+		return $db->executeCommand('EVAL', array($script, 0));
+	}
+
+	/**
 	 * Returns the number of records.
 	 * @param string $q the COUNT expression. Defaults to '*'.
 	 * Make sure you properly quote column names.
@@ -187,8 +209,54 @@ class ActiveQuery extends \yii\base\Component
 	}
 
 	/**
+	 * Returns the average of the specified column values.
+	 * @param string $column the column name or expression.
+	 * Make sure you properly quote column names in the expression.
+	 * @return integer the average of the specified column values.
+	 */
+	public function average($column)
+	{
+		$modelClass = $this->modelClass;
+		/** @var Connection $db */
+		$db = $modelClass::getDb();
+		$script = $db->luaScriptBuilder->buildAverage($this, $column);
+		return $db->executeCommand('EVAL', array($script, 0));
+	}
+
+	/**
+	 * Returns the minimum of the specified column values.
+	 * @param string $column the column name or expression.
+	 * Make sure you properly quote column names in the expression.
+	 * @return integer the minimum of the specified column values.
+	 */
+	public function min($column)
+	{
+		$modelClass = $this->modelClass;
+		/** @var Connection $db */
+		$db = $modelClass::getDb();
+		$script = $db->luaScriptBuilder->buildMin($this, $column);
+		return $db->executeCommand('EVAL', array($script, 0));
+	}
+
+	/**
+	 * Returns the maximum of the specified column values.
+	 * @param string $column the column name or expression.
+	 * Make sure you properly quote column names in the expression.
+	 * @return integer the maximum of the specified column values.
+	 */
+	public function max($column)
+	{
+		$modelClass = $this->modelClass;
+		/** @var Connection $db */
+		$db = $modelClass::getDb();
+		$script = $db->luaScriptBuilder->buildMax($this, $column);
+		return $db->executeCommand('EVAL', array($script, 0));
+	}
+
+	/**
 	 * Returns the query result as a scalar value.
 	 * The value returned will be the first column in the first row of the query results.
+	 * @param string $column name of the column to select
 	 * @return string|boolean the value of the first column in the first row of the query result.
 	 * False is returned if the query result is empty.
 	 */
@@ -210,7 +278,6 @@ class ActiveQuery extends \yii\base\Component
 
 	/**
 	 * Sets the [[asArray]] property.
-	 * TODO: refactor, it is duplicated from yii/db/ActiveQuery
 	 * @param boolean $value whether to return the query results in terms of arrays instead of Active Records.
 	 * @return ActiveQuery the query object itself
 	 */
@@ -221,8 +288,62 @@ class ActiveQuery extends \yii\base\Component
 	}
 
 	/**
+	 * Sets the ORDER BY part of the query.
+	 * @param string|array $columns the columns (and the directions) to be ordered by.
+	 * Columns can be specified in either a string (e.g. "id ASC, name DESC") or an array
+	 * (e.g. `array('id' => Query::SORT_ASC, 'name' => Query::SORT_DESC)`).
+	 * The method will automatically quote the column names unless a column contains some parenthesis
+	 * (which means the column contains a DB expression).
+	 * @return Query the query object itself
+	 * @see addOrderBy()
+	 */
+	public function orderBy($columns)
+	{
+		$this->orderBy = $this->normalizeOrderBy($columns);
+		return $this;
+	}
+
+	/**
+	 * Adds additional ORDER BY columns to the query.
+	 * @param string|array $columns the columns (and the directions) to be ordered by.
+	 * Columns can be specified in either a string (e.g. "id ASC, name DESC") or an array
+	 * (e.g. `array('id' => Query::SORT_ASC, 'name' => Query::SORT_DESC)`).
+	 * The method will automatically quote the column names unless a column contains some parenthesis
+	 * (which means the column contains a DB expression).
+	 * @return Query the query object itself
+	 * @see orderBy()
+	 */
+	public function addOrderBy($columns)
+	{
+		$columns = $this->normalizeOrderBy($columns);
+		if ($this->orderBy === null) {
+			$this->orderBy = $columns;
+		} else {
+			$this->orderBy = array_merge($this->orderBy, $columns);
+		}
+		return $this;
+	}
+
+	protected function normalizeOrderBy($columns)
+	{
+		if (is_array($columns)) {
+			return $columns;
+		} else {
+			$columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY);
+			$result = array();
+			foreach ($columns as $column) {
+				if (preg_match('/^(.*?)\s+(asc|desc)$/i', $column, $matches)) {
+					$result[$matches[1]] = strcasecmp($matches[2], 'desc') ? self::SORT_ASC : self::SORT_DESC;
+				} else {
+					$result[$column] = self::SORT_ASC;
+				}
+			}
+			return $result;
+		}
+	}
+
+	/**
 	 * Sets the LIMIT part of the query.
-	 * TODO: refactor, it is duplicated from yii/db/Query
 	 * @param integer $limit the limit
 	 * @return ActiveQuery the query object itself
 	 */
@@ -234,7 +355,6 @@ class ActiveQuery extends \yii\base\Component
 
 	/**
 	 * Sets the OFFSET part of the query.
-	 * TODO: refactor, it is duplicated from yii/db/Query
 	 * @param integer $offset the offset
 	 * @return ActiveQuery the query object itself
 	 */
@@ -264,7 +384,6 @@ class ActiveQuery extends \yii\base\Component
 	 * ))->all();
 	 * ~~~
 	 *
-	 * TODO: refactor, it is duplicated from yii/db/ActiveQuery
 	 * @return ActiveQuery the query object itself
 	 */
 	public function with()
@@ -279,7 +398,6 @@ class ActiveQuery extends \yii\base\Component
 
 	/**
 	 * Sets the [[indexBy]] property.
-	 * TODO: refactor, it is duplicated from yii/db/ActiveQuery
 	 * @param string $column the name of the column by which the query results should be indexed by.
 	 * @return ActiveQuery the query object itself
 	 */
diff --git a/framework/yii/redis/ActiveRecord.php b/framework/yii/redis/ActiveRecord.php
index 0a1f7bd..6fdbe58 100644
--- a/framework/yii/redis/ActiveRecord.php
+++ b/framework/yii/redis/ActiveRecord.php
@@ -20,8 +20,6 @@ use yii\db\TableSchema;
 /**
  * ActiveRecord is the base class for classes representing relational data in terms of objects.
  *
- *
- *
  * @author Carsten Brandt <mail@cebe.cc>
  * @since 2.0
  */
diff --git a/framework/yii/redis/ActiveRelation.php b/framework/yii/redis/ActiveRelation.php
index a36f19d..b78c200 100644
--- a/framework/yii/redis/ActiveRelation.php
+++ b/framework/yii/redis/ActiveRelation.php
@@ -13,7 +13,6 @@ namespace yii\redis;
 /**
  * ActiveRecord is the base class for classes representing relational data in terms of objects.
  *
- *
  * @author Carsten Brandt <mail@cebe.cc>
  * @since 2.0
  */
diff --git a/framework/yii/redis/Connection.php b/framework/yii/redis/Connection.php
index cc6c253..0b45659 100644
--- a/framework/yii/redis/Connection.php
+++ b/framework/yii/redis/Connection.php
@@ -22,6 +22,7 @@ use yii\helpers\Inflector;
  *
  * @property string $driverName Name of the DB driver. This property is read-only.
  * @property boolean $isActive Whether the DB connection is established. This property is read-only.
+ * @property LuaScriptBuilder $luaScriptBuilder This property is read-only.
  * @property Transaction $transaction The currently active transaction. Null if no active transaction. This
  * property is read-only.
  *
@@ -333,6 +334,9 @@ class Connection extends Component
 		}
 	}
 
+	/**
+	 * @return LuaScriptBuilder
+	 */
 	public function getLuaScriptBuilder()
 	{
 		return new LuaScriptBuilder();
diff --git a/framework/yii/redis/LuaScriptBuilder.php b/framework/yii/redis/LuaScriptBuilder.php
index f9b6cf6..f6ebeb5 100644
--- a/framework/yii/redis/LuaScriptBuilder.php
+++ b/framework/yii/redis/LuaScriptBuilder.php
@@ -19,18 +19,28 @@ class LuaScriptBuilder extends \yii\base\Object
 {
 	public function buildAll($query)
 	{
+		// TODO add support for orderBy
 		$modelClass = $query->modelClass;
 		$key = $modelClass::tableName();
-		return $this->build($query, "n=n+1 pks[n] = redis.call('HGETALL','$key:a:' .. pk)", 'pks'); // TODO quote
+		return $this->build($query, "n=n+1 pks[n]=redis.call('HGETALL','$key:a:' .. pk)", 'pks'); // TODO quote
 	}
 
 	public function buildOne($query)
 	{
+		// TODO add support for orderBy
 		$modelClass = $query->modelClass;
 		$key = $modelClass::tableName();
 		return $this->build($query, "do return redis.call('HGETALL','$key:a:' .. pk) end", 'pks'); // TODO quote
 	}
 
+	public function buildColumn($query, $field)
+	{
+		// TODO add support for orderBy and indexBy
+		$modelClass = $query->modelClass;
+		$key = $modelClass::tableName();
+		return $this->build($query, "n=n+1 pks[n]=redis.call('HGET','$key:a:' .. pk,'$field')", 'pks'); // TODO quote
+	}
+
 	public function buildCount($query)
 	{
 		return $this->build($query, 'n=n+1', 'n');
@@ -43,6 +53,27 @@ class LuaScriptBuilder extends \yii\base\Object
 		return $this->build($query, "n=n+redis.call('HGET','$key:a:' .. pk,'$field')", 'n'); // TODO quote
 	}
 
+	public function buildAverage($query, $field)
+	{
+		$modelClass = $query->modelClass;
+		$key = $modelClass::tableName();
+		return $this->build($query, "n=n+1 if v==nil then v=0 end v=v+redis.call('HGET','$key:a:' .. pk,'$field')", 'v/n'); // TODO quote
+	}
+
+	public function buildMin($query, $field)
+	{
+		$modelClass = $query->modelClass;
+		$key = $modelClass::tableName();
+		return $this->build($query, "n=redis.call('HGET','$key:a:' .. pk,'$field') if v==nil or n<v then v=n end", 'v'); // TODO quote
+	}
+
+	public function buildMax($query, $field)
+	{
+		$modelClass = $query->modelClass;
+		$key = $modelClass::tableName();
+		return $this->build($query, "n=redis.call('HGET','$key:a:' .. pk,'$field') if v==nil or n>v then v=n end", 'v'); // TODO quote
+	}
+
 	/**
 	 * @param ActiveQuery $query
 	 */
@@ -69,6 +100,7 @@ class LuaScriptBuilder extends \yii\base\Object
 local allpks=redis.call('LRANGE','$key',0,-1)
 local pks={}
 local n=0
+local v=nil
 local i=0
 for k,pk in ipairs(allpks) do
     $loadColumnValues
@@ -100,47 +132,6 @@ EOF;
 	}
 
 	/**
-	 * @param array $columns
-	 * @return string the GROUP BY clause
-	 */
-	public function buildGroupBy($columns)
-	{
-		return empty($columns) ? '' : 'GROUP BY ' . $this->buildColumns($columns);
-	}
-
-	/**
-	 * @param string|array $condition
-	 * @param array $params the binding parameters to be populated
-	 * @return string the HAVING clause built from [[query]].
-	 */
-	public function buildHaving($condition, &$params)
-	{
-		$having = $this->buildCondition($condition, $params);
-		return $having === '' ? '' : 'HAVING ' . $having;
-	}
-
-	/**
-	 * @param array $columns
-	 * @return string the ORDER BY clause built from [[query]].
-	 */
-	public function buildOrderBy($columns)
-	{
-		if (empty($columns)) {
-			return '';
-		}
-		$orders = array();
-		foreach ($columns as $name => $direction) {
-			if (is_object($direction)) {
-				$orders[] = (string)$direction;
-			} else {
-				$orders[] = $this->db->quoteColumnName($name) . ($direction === Query::SORT_DESC ? ' DESC' : '');
-			}
-		}
-
-		return 'ORDER BY ' . implode(', ', $orders);
-	}
-
-	/**
 	 * Parses the condition specification and generates the corresponding SQL expression.
 	 * @param string|array $condition the condition specification. Please refer to [[Query::where()]]
 	 * on how to specify a condition.
diff --git a/tests/unit/framework/redis/ActiveRecordTest.php b/tests/unit/framework/redis/ActiveRecordTest.php
index a3a5559..e5a5762 100644
--- a/tests/unit/framework/redis/ActiveRecordTest.php
+++ b/tests/unit/framework/redis/ActiveRecordTest.php
@@ -2,6 +2,7 @@
 
 namespace yiiunit\framework\redis;
 
+use yii\db\Query;
 use yii\redis\ActiveQuery;
 use yiiunit\data\ar\redis\ActiveRecord;
 use yiiunit\data\ar\redis\Customer;
@@ -134,11 +135,10 @@ class ActiveRecordTest extends RedisTestCase
 		$this->assertEquals(2, $customer->id);
 
 		// find count, sum, average, min, max, scalar
-/*		$this->assertEquals(6, Customer::find()->sum('id'));
+		$this->assertEquals(6, Customer::find()->sum('id'));
 		$this->assertEquals(2, Customer::find()->average('id'));
 		$this->assertEquals(1, Customer::find()->min('id'));
 		$this->assertEquals(3, Customer::find()->max('id'));
-		$this->assertEquals(3, Customer::find()->select('COUNT(*)')->scalar());*/
 
 		// scope
 //		$this->assertEquals(2, Customer::find()->active()->count());
@@ -227,6 +227,12 @@ class ActiveRecordTest extends RedisTestCase
 		$this->assertEquals(7, OrderItem::find()->sum('quantity'));
 	}
 
+	public function testFindColumn()
+	{
+		$this->assertEquals(array('user1', 'user2', 'user3'), Customer::find()->column('name'));
+//		TODO $this->assertEquals(array('user3', 'user2', 'user1'), Customer::find()->orderBy(array('name' => Query::SORT_DESC))->column('name'));
+	}
+
 	public function testExists()
 	{
 		$this->assertTrue(Customer::find()->where(array('id' => 2))->exists());