diff --git a/Classes/PHPExcel/Calculation.php b/Classes/PHPExcel/Calculation.php
index 7e839cd..ccaa782 100644
--- a/Classes/PHPExcel/Calculation.php
+++ b/Classes/PHPExcel/Calculation.php
@@ -559,11 +559,11 @@ class PHPExcel_Calculation {
 												 'argumentCount'	=>	'4,5'
 												),
 				'DCOUNT'				=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATABASE,
-												 'functionCall'		=>	'PHPExcel_Calculation_Functions::DUMMY',
+												 'functionCall'		=>	'PHPExcel_Calculation_Database::DCOUNT',
 												 'argumentCount'	=>	'3'
 												),
 				'DCOUNTA'				=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATABASE,
-												 'functionCall'		=>	'PHPExcel_Calculation_Functions::DUMMY',
+												 'functionCall'		=>	'PHPExcel_Calculation_Database::DCOUNTA',
 												 'argumentCount'	=>	'3'
 												),
 				'DDB'					=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_FINANCIAL,
@@ -603,11 +603,11 @@ class PHPExcel_Calculation {
 												 'argumentCount'	=>	'4,5'
 												),
 				'DMAX'					=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATABASE,
-												 'functionCall'		=>	'PHPExcel_Calculation_Functions::DUMMY',
+												 'functionCall'		=>	'PHPExcel_Calculation_Database::DMAX',
 												 'argumentCount'	=>	'3'
 												),
 				'DMIN'					=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATABASE,
-												 'functionCall'		=>	'PHPExcel_Calculation_Functions::DUMMY',
+												 'functionCall'		=>	'PHPExcel_Calculation_Database::DMIN',
 												 'argumentCount'	=>	'3'
 												),
 				'DOLLAR'				=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_TEXT_AND_DATA,
@@ -623,19 +623,19 @@ class PHPExcel_Calculation {
 												 'argumentCount'	=>	'2'
 												),
 				'DPRODUCT'				=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATABASE,
-												 'functionCall'		=>	'PHPExcel_Calculation_Functions::DUMMY',
+												 'functionCall'		=>	'PHPExcel_Calculation_Database::DPRODUCT',
 												 'argumentCount'	=>	'3'
 												),
 				'DSTDEV'				=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATABASE,
-												 'functionCall'		=>	'PHPExcel_Calculation_Functions::DUMMY',
+												 'functionCall'		=>	'PHPExcel_Calculation_Database::DSTDEV',
 												 'argumentCount'	=>	'3'
 												),
 				'DSTDEVP'				=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATABASE,
-												 'functionCall'		=>	'PHPExcel_Calculation_Functions::DUMMY',
+												 'functionCall'		=>	'PHPExcel_Calculation_Database::DSTDEVP',
 												 'argumentCount'	=>	'3'
 												),
 				'DSUM'					=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATABASE,
-												 'functionCall'		=>	'PHPExcel_Calculation_Functions::DUMMY',
+												 'functionCall'		=>	'PHPExcel_Calculation_Database::DSUM',
 												 'argumentCount'	=>	'3'
 												),
 				'DURATION'				=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_FINANCIAL,
@@ -643,11 +643,11 @@ class PHPExcel_Calculation {
 												 'argumentCount'	=>	'5,6'
 												),
 				'DVAR'					=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATABASE,
-												 'functionCall'		=>	'PHPExcel_Calculation_Functions::DUMMY',
+												 'functionCall'		=>	'PHPExcel_Calculation_Database::DVAR',
 												 'argumentCount'	=>	'3'
 												),
 				'DVARP'					=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATABASE,
-												 'functionCall'		=>	'PHPExcel_Calculation_Functions::DUMMY',
+												 'functionCall'		=>	'PHPExcel_Calculation_Database::DVARP',
 												 'argumentCount'	=>	'3'
 												),
 				'EDATE'					=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_DATE_AND_TIME,
diff --git a/Classes/PHPExcel/Calculation/Database.php b/Classes/PHPExcel/Calculation/Database.php
new file mode 100644
index 0000000..3e267a3
--- /dev/null
+++ b/Classes/PHPExcel/Calculation/Database.php
@@ -0,0 +1,358 @@
+<?php
+/**
+ * PHPExcel
+ *
+ * Copyright (c) 2006 - 2011 PHPExcel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * @category	PHPExcel
+ * @package		PHPExcel_Calculation
+ * @copyright	Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
+ * @license		http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
+ * @version		##VERSION##, ##DATE##
+ */
+
+
+/** PHPExcel root directory */
+if (!defined('PHPEXCEL_ROOT')) {
+	/**
+	 * @ignore
+	 */
+	define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');
+	require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
+}
+
+
+/**
+ * PHPExcel_Calculation_Database
+ *
+ * @category	PHPExcel
+ * @package		PHPExcel_Calculation
+ * @copyright	Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_Calculation_Database {
+
+
+	private static function __fieldExtract($database,$field) {
+		$field = strtoupper(PHPExcel_Calculation_Functions::flattenSingleValue($field));
+		$fieldNames = array_map('strtoupper',array_shift($database));
+
+		if (is_numeric($field)) {
+			$keys = array_keys($fieldNames);
+			return $keys[$field-1];
+		}
+		$key = array_search($field,$fieldNames);
+		return ($key) ? $key : null;
+	}
+
+	private static function __filter($database,$criteria) {
+		$fieldNames = array_shift($database);
+		$criteriaNames = array_shift($criteria);
+
+		//	Convert the criteria into a set of AND/OR conditions with [:placeholders]
+		$testConditions = $testValues = array();
+		$testConditionsCount = 0;
+		foreach($criteriaNames as $key => $criteriaName) {
+			$testCondition = array();
+			$testConditionCount = 0;
+			foreach($criteria as $row => $criterion) {
+				if ($criterion[$key] > '') {
+					$testCondition[] = '[:'.$criteriaName.']'.PHPExcel_Calculation_Functions::_ifCondition($criterion[$key]);
+					$testConditionCount++;
+				}
+			}
+			if ($testConditionCount > 1) {
+				$testConditions[] = 'OR('.implode(',',$testCondition).')';
+				$testConditionsCount++;
+			} elseif($testConditionCount == 1) {
+				$testConditions[] = $testCondition[0];
+				$testConditionsCount++;
+			}
+		}
+		if ($testConditionsCount > 1) {
+			$testConditionSet = 'AND('.implode(',',$testConditions).')';
+		} elseif($testConditionsCount == 1) {
+			$testConditionSet = $testConditions[0];
+		}
+
+		//	Loop through each row of the database
+		foreach($database as $dataRow => $dataValues) {
+			//	Substitute actual values from the database row for our [:placeholders]
+			$testConditionList = $testConditionSet;
+			foreach($criteriaNames as $key => $criteriaName) {
+				$k = array_search($criteriaName,$fieldNames);
+				if (isset($dataValues[$k])) {
+					$dataValue = $dataValues[$k];
+					$dataValue = (is_string($dataValue)) ? PHPExcel_Calculation::_wrapResult(strtoupper($dataValue)) : $dataValue;
+					$testConditionList = str_replace('[:'.$criteriaName.']',$dataValue,$testConditionList);
+				}
+			}
+			//	evaluate the criteria against the row data
+			$result = PHPExcel_Calculation::getInstance()->_calculateFormulaValue('='.$testConditionList);
+			//	If the row failed to meet the criteria, remove it from the database
+			if (!$result) {
+				unset($database[$dataRow]);
+			}
+		}
+
+		return $database;
+	}
+
+
+	/**
+	 *	DAVERAGE
+	 *
+	 */
+	public static function DAVERAGE($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_Statistical::AVERAGE($colData);
+	}	//	function DAVERAGE()
+
+	/**
+	 *	DCOUNT
+	 *
+	 */
+	public static function DCOUNT($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_Statistical::COUNT($colData);
+	}	//	function DCOUNT()
+
+	/**
+	 *	DCOUNTA
+	 *
+	 */
+	public static function DCOUNTA($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_Statistical::COUNTA($colData);
+	}	//	function DCOUNTA()
+
+	/**
+	 *	DMAX
+	 *
+	 */
+	public static function DMAX($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_Statistical::MAX($colData);
+	}	//	function DMAX()
+
+	/**
+	 *	DMIN
+	 *
+	 */
+	public static function DMIN($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_Statistical::MIN($colData);
+	}	//	function DMIN()
+
+	/**
+	 *	DPRODUCT
+	 *
+	 */
+	public static function DPRODUCT($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_MathTrig::PRODUCT($colData);
+	}	//	function DPRODUCT()
+
+	/**
+	 *	DSTDEV
+	 *
+	 */
+	public static function DSTDEV($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_Statistical::STDEV($colData);
+	}	//	function DSTDEV()
+
+	/**
+	 *	DSTDEVP
+	 *
+	 */
+	public static function DSTDEVP($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_Statistical::STDEVP($colData);
+	}	//	function DSTDEVP()
+
+	/**
+	 *	DSUM
+	 *
+	 */
+	public static function DSUM($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_MathTrig::SUM($colData);
+	}	//	function DSUM()
+
+	/**
+	 *	DVAR
+	 *
+	 */
+	public static function DVAR($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_Statistical::VARFunc($colData);
+	}	//	function DVAR()
+
+	/**
+	 *	DVARP
+	 *
+	 */
+	public static function DVARP($database,$field,$criteria) {
+		$field = self::__fieldExtract($database,$field);
+		if (is_null($field)) {
+			return NULL;
+		}
+
+		//	reduce the database to a set of rows that match all the criteria
+		$database = self::__filter($database,$criteria);
+		//	extract an array of values for the requested column
+		$colData = array();
+		foreach($database as $row) {
+			$colData[] = $row[$field];
+		}
+
+		// Return
+		return PHPExcel_Calculation_Statistical::VARP($colData);
+	}	//	function DVARP()
+
+
+}	//	class PHPExcel_Calculation_Database
diff --git a/Documentation/FunctionListByCategory.txt b/Documentation/FunctionListByCategory.txt
index bc84057..97884c1 100644
--- a/Documentation/FunctionListByCategory.txt
+++ b/Documentation/FunctionListByCategory.txt
@@ -8,18 +8,18 @@ CATEGORY_CUBE
 	CUBEVALUE               ***  Not yet Implemented
 
 CATEGORY_DATABASE
-	DAVERAGE                ***  Not yet Implemented
-	DCOUNT                  ***  Not yet Implemented
-	DCOUNTA                 ***  Not yet Implemented
+	DAVERAGE                PHPExcel_Calculation_Database::DAVERAGE
+	DCOUNT                  PHPExcel_Calculation_Database::DCOUNT
+	DCOUNTA                 PHPExcel_Calculation_Database::DCOUNTA
 	DGET                    ***  Not yet Implemented
-	DMAX                    ***  Not yet Implemented
-	DMIN                    ***  Not yet Implemented
-	DPRODUCT                ***  Not yet Implemented
-	DSTDEV                  ***  Not yet Implemented
-	DSTDEVP                 ***  Not yet Implemented
-	DSUM                    ***  Not yet Implemented
-	DVAR                    ***  Not yet Implemented
-	DVARP                   ***  Not yet Implemented
+	DMAX                    PHPExcel_Calculation_Database::DMAX
+	DMIN                    PHPExcel_Calculation_Database::DMIN
+	DPRODUCT                PHPExcel_Calculation_Database::DPRODUCT
+	DSTDEV                  PHPExcel_Calculation_Database::DSTDEV
+	DSTDEVP                 PHPExcel_Calculation_Database::DSTDEVP
+	DSUM                    PHPExcel_Calculation_Database::DSUM
+	DVAR                    PHPExcel_Calculation_Database::DVAR
+	DVARP                   PHPExcel_Calculation_Database::DVARP
 
 CATEGORY_DATE_AND_TIME
 	DATE                    PHPExcel_Calculation_DateTime::DATE
diff --git a/Documentation/FunctionListByName.txt b/Documentation/FunctionListByName.txt
index 6b17edb..ff80d4b 100644
--- a/Documentation/FunctionListByName.txt
+++ b/Documentation/FunctionListByName.txt
@@ -77,12 +77,12 @@ CUMPRINC                CATEGORY_FINANCIAL              PHPExcel_Calculation_Fin
 DATE                    CATEGORY_DATE_AND_TIME          PHPExcel_Calculation_DateTime::DATE
 DATEDIF                 CATEGORY_DATE_AND_TIME          PHPExcel_Calculation_DateTime::DATEDIF
 DATEVALUE               CATEGORY_DATE_AND_TIME          PHPExcel_Calculation_DateTime::DATEVALUE
-DAVERAGE                CATEGORY_DATABASE               ***  Not yet Implemented
+DAVERAGE                CATEGORY_DATABASE               PHPExcel_Calculation_Database::DAVERAGE
 DAY                     CATEGORY_DATE_AND_TIME          PHPExcel_Calculation_DateTime::DAYOFMONTH
 DAYS360                 CATEGORY_DATE_AND_TIME          PHPExcel_Calculation_DateTime::DAYS360
 DB                      CATEGORY_FINANCIAL              PHPExcel_Calculation_Financial::DB
-DCOUNT                  CATEGORY_DATABASE               ***  Not yet Implemented
-DCOUNTA                 CATEGORY_DATABASE               ***  Not yet Implemented
+DCOUNT                  CATEGORY_DATABASE               PHPExcel_Calculation_Database::DCOUNT
+DCOUNTA                 CATEGORY_DATABASE               PHPExcel_Calculation_Database::DCOUNTA
 DDB                     CATEGORY_FINANCIAL              PHPExcel_Calculation_Financial::DDB
 DEC2BIN                 CATEGORY_ENGINEERING            PHPExcel_Calculation_Engineering::DECTOBIN
 DEC2HEX                 CATEGORY_ENGINEERING            PHPExcel_Calculation_Engineering::DECTOHEX
@@ -92,18 +92,18 @@ DELTA                   CATEGORY_ENGINEERING            PHPExcel_Calculation_Eng
 DEVSQ                   CATEGORY_STATISTICAL            PHPExcel_Calculation_Statistical::DEVSQ
 DGET                    CATEGORY_DATABASE               ***  Not yet Implemented
 DISC                    CATEGORY_FINANCIAL              PHPExcel_Calculation_Financial::DISC
-DMAX                    CATEGORY_DATABASE               ***  Not yet Implemented
-DMIN                    CATEGORY_DATABASE               ***  Not yet Implemented
+DMAX                    CATEGORY_DATABASE               PHPExcel_Calculation_Database::DMAX
+DMIN                    CATEGORY_DATABASE               PHPExcel_Calculation_Database::DMIN
 DOLLAR                  CATEGORY_TEXT_AND_DATA          PHPExcel_Calculation_TextData::DOLLAR
 DOLLARDE                CATEGORY_FINANCIAL              PHPExcel_Calculation_Financial::DOLLARDE
 DOLLARFR                CATEGORY_FINANCIAL              PHPExcel_Calculation_Financial::DOLLARFR
-DPRODUCT                CATEGORY_DATABASE               ***  Not yet Implemented
-DSTDEV                  CATEGORY_DATABASE               ***  Not yet Implemented
-DSTDEVP                 CATEGORY_DATABASE               ***  Not yet Implemented
-DSUM                    CATEGORY_DATABASE               ***  Not yet Implemented
+DPRODUCT                CATEGORY_DATABASE               PHPExcel_Calculation_Database::DPRODUCT
+DSTDEV                  CATEGORY_DATABASE               PHPExcel_Calculation_Database::DSTDEV
+DSTDEVP                 CATEGORY_DATABASE               PHPExcel_Calculation_Database::DSTDEVP
+DSUM                    CATEGORY_DATABASE               PHPExcel_Calculation_Database::DSUM
 DURATION                CATEGORY_FINANCIAL              ***  Not yet Implemented
-DVAR                    CATEGORY_DATABASE               ***  Not yet Implemented
-DVARP                   CATEGORY_DATABASE               ***  Not yet Implemented
+DVAR                    CATEGORY_DATABASE               PHPExcel_Calculation_Database::DVAR
+DVARP                   CATEGORY_DATABASE               PHPExcel_Calculation_Database::DVARP
 
 EDATE                   CATEGORY_DATE_AND_TIME          PHPExcel_Calculation_DateTime::EDATE
 EFFECT                  CATEGORY_FINANCIAL              PHPExcel_Calculation_Financial::EFFECT
diff --git a/changelog.txt b/changelog.txt
index 66dc2db..6f0de4f 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -35,6 +35,8 @@ Fixed in SVN:
 					 Modified the toArray() method so that it actually uses rangeToArray().
 - Feature:	(MBaker) Added support for cell comments in the OOCalc, Gnumeric and Excel2003XML Readers, and in the Excel5 Reader
 - Feature:  (MBaker) Improved toFormattedString() handling for Currency and Accounting formats to render currency symbols
+- Feature:  (MBaker) Work Item  2346 - Implement more Excel calculation functions
+            -   Implemented the DAVERAGE(), DCOUNT(), DCOUNTA(), DMAX(), DMIN(), DPRODUCT(), DSTDEV(), DSTDEVP(), DSUM(), DVAR() and DVARP() Database functions
 - Bugfix:   (MBaker) Work item 14888 - Simple =IF() formula disappears
 - Bugfix:	(MBaker) Work item 14898 - PHP Warning: preg_match(): Compilation failed: PCRE does not support \\L, \\l, \\N, \\P, \\p, \\U, \\u, or \\X
 - Bugfix:	(MBaker) Work item 14901 - VLOOKUP choking on parameters in PHPExcel.1.7.5/PHPExcel_Writer_Excel2007