Выборка с максимальным значением поля по группировке

dump

--
-- Current Database: `localdb`
--

CREATE DATABASE /*!32312 IF NOT EXISTS*/ `localdb` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `localdb`;

-- MySQL dump 10.13  Distrib 5.6.22, for Win32 (x86)
--
-- Host: localhost    Database: localdb
-- ------------------------------------------------------
-- Server version 5.6.26

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Table structure for table `call_history`
--

DROP TABLE IF EXISTS `call_history`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `call_history` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'PK',
  `id_call` int(11) NOT NULL COMMENT 'общий ид для всех звонков',
  `dt_status` datetime(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) COMMENT 'дата звонка',
  `status` varchar(256) DEFAULT NULL COMMENT 'текстовый статус',
  PRIMARY KEY (`id`),
  UNIQUE KEY `id` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8 PACK_KEYS=0;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `call_history`
--

LOCK TABLES `call_history` WRITE;
/*!40000 ALTER TABLE `call_history` DISABLE KEYS */;
INSERT INTO `call_history` VALUES (1,1,'2016-05-19 08:23:29.000000','недозвон'),(2,1,'2016-05-19 08:24:29.000000','ответ'),(3,2,'2016-05-19 08:24:17.000000','недозвон'),(4,2,'2016-05-19 08:23:17.000000','test'),(5,2,'2016-05-19 08:25:17.000000','ответ'),(6,3,'2016-05-19 08:24:48.000000','ответ'),(7,3,'2016-05-19 08:23:48.000000','недозвон'),(8,3,'2016-05-19 08:25:48.000000','test');
/*!40000 ALTER TABLE `call_history` ENABLE KEYS */;
UNLOCK TABLES;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

-- Dump completed on 2016-05-19  8:54:08

задача - найти первые статусы по звонку (id_call)

SELECT min(dt_status),
          status
   FROM call_history
   GROUP BY id_call