create database blogdb;
create table users(
	id int unsigned not null primary key auto_increment,
    name varchar(32) null unique,
    email varchar(100) null,
    cdate datetime null);
create table blog(
	id int unsigned not null primary key auto_increment,
    title varchar(100) not null,
    abstract varchar(200) not null,
    content text not null,
    uid int unsigned null,
    pcount int unsigned default 0,
    flag tinyint unsigned default 0,
    cdate datetime);
 

-- MySQL dump 10.13  Distrib 5.7.12, for Win64 (x86_64)
--
-- Host: localhost    Database: blogdb
-- ------------------------------------------------------
-- Server version	5.7.17-log

/*!40101 SET @[email protected]@CHARACTER_SET_CLIENT */;
/*!40101 SET @[email protected]@CHARACTER_SET_RESULTS */;
/*!40101 SET @
 
[email protected]@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @[email protected]@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @[email protected]@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @[email protected]@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @[email protected]
 
@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @[email protected]@SQL_NOTES, SQL_NOTES=0 */;

--
-- Table structure for table `blog`
--

DROP TABLE IF EXISTS `blog`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `blog` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `title` varchar(100) NOT NULL,
  `abstract` varchar(200) NOT NULL,
  `content` text NOT NULL,
  `uid` int(11) DEFAULT NULL,
  `pcount` int(11) DEFAULT '0',
  `flag` tinyint(4) DEFAULT '0',
  `cdate` datetime DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `blog`
--

LOCK TABLES `blog` WRITE;
/*!40000 ALTER TABLE `blog` DISABLE KEYS */;
INSERT INTO `blog` VALUES (1,'qwer','qwerqwer','qwer',1,888,1,'2000-02-05 00:00:00'),(2,'a','aaaaaaaa','aaaa',2,222,1,'2010-05-05 00:00:00'),(3,'wasd','wasdwasd','wasd',3,333,1,'2005-09-01 00:00:00'),(4,'b','bbbbbbbb','bbbb',4,444,2,'1999-01-01 00:00:00'),(5,'zxc','zxczxcesc','zxc',5,50,1,'2015-06-07 00:00:00'),(6,'c','cccccccc','cccccc',6,666,1,'2016-06-06 00:00:00'),(7,'ijkl','ijklijkl','ijkl',7,77,0,'2018-01-01 00:00:00'),(8,'d','dddddddd','dddddddd',8,90,2,'2018-02-02 00:00:00'),(9,'jkuiol','jkuiol','jkuiol',9,100,1,'2018-03-03 00:00:00'),(10,'123456789','123456789','123456789',10,1,1,'2017-07-05 00:00:00'),(11,'10','10','10',6,606,1,'2016-01-06 00:00:00');
/*!40000 ALTER TABLE `blog` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `users`
--

DROP TABLE IF EXISTS `users`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(32) DEFAULT NULL,
  `email` varchar(100) DEFAULT NULL,
  `cdate` datetime DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `users`
--

LOCK TABLES `users` WRITE;
/*!40000 ALTER TABLE `users` DISABLE KEYS */;
INSERT INTO `users` VALUES (1,'zhangsan','[email protected]','1999-09-09 00:00:00'),(2,'lisi','[email protected]','2000-01-01 00:00:00'),(3,'wangwu','[email protected]','1996-06-06 00:00:00'),(4,'zhaoliu','[email protected]','1998-08-08 00:00:00'),(5,'ll','[email protected]','1997-07-07 00:00:00'),(6,'aa','[email protected]','2010-10-10 00:00:00'),(7,'bb','[email protected]','2002-02-02 00:00:00'),(8,'q','qqqqqq','1990-09-09 00:00:00'),(9,'w','wwwwww','1998-03-03 00:00:00'),(10,'e','eeeeee','2013-08-08 00:00:00'),(11,'r','rrrrrr','2001-05-06 00:00:00');
/*!40000 ALTER TABLE `users` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Dumping events for database 'blogdb'
--

--
-- Dumping routines for database 'blogdb'
--
/*!40103 SET [email protected]_TIME_ZONE */;

/*!40101 SET [email protected]_SQL_MODE */;
/*!40014 SET [email protected]_FOREIGN_KEY_CHECKS */;
/*!40014 SET [email protected]_UNIQUE_CHECKS */;
/*!40101 SET [email protected]_CHARACTER_SET_CLIENT */;
/*!40101 SET [email protected]_CHARACTER_SET_RESULTS */;
/*!40101 SET [email protected]_COLLATION_CONNECTION */;
/*!40111 SET [email protected]_SQL_NOTES */;

-- Dump completed on 2018-03-29 21:04:07

/*1. 在users表中查詢註冊時間最早的十條會員資訊。 */
select * from users order by cdate limit 10
/*2.從兩個表中查詢點贊數最高的5條部落格資訊，要求顯示欄位：（博文id，標題，點贊數，會員名）*/
select b.id,b.title,b.pcount,u.name from blog b,users u where u.id=b.uid order by pcount desc limit 0,5
/*3. 統計每個會員的發表博文數量（降序），要求顯示欄位（會員id號，姓名，博文數量）*/
select u.id,u.name,count(*) from users u,blog b where u.id=b.uid group by u.id
/*4. 獲取會員的博文平均點贊數量最高的三位。顯示欄位（會員id，姓名，平均點贊數）*/
select u.id,u.name,avg(b.pcount)  from users u,blog b where u.id=b.uid group by u.id order by avg(b.pcount) desc limit 0,3
/*5. 刪除沒有發表博文的所有會員資訊。*/
delete * from users u where u.id not in (select b.uid from blog b)