MySQL语句汇总整理

1.选择数据库 USE

刚链接到MySQL时,没有数据库打开供你使用,而我们需要选择一个数据库,才能进行以下的操作。

方法:USE语句

USE Mdatabase;

如此,才能打开数据库,读取其中的数据

2.显示信息 SHOW

MySQL从内部表中提取信息

SHOW database;

返回可用数据库的一个列表

SHOW tables;

返回数据库内的表的列表

SHOW columns from table;

显示表列

3.创建表 CREATE TABLE

基本语法:

//by LMY
CREATE DATABASE 数据库名;   /*创建数据库*/
USE 数据库名;   /*连接数据库*/

CREATE TABLE 表名1
(
    列名1   数据类型    要求,
    列名2   数据类型    要求,
    列名3   数据类型    要求,
    .......
    PRIMARY KEY (主键) /*注意,此处没有逗号*/
);

以我的数据库作业作为栗子:

(环境,MySQL workbench

要求:

创建一个名为”my_own_movie_database“的数据库,之后,建如下几个表,之后把相应输入插入

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首先,打开workbench,添加一个新的SQL文件

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之后,在新的文件中写入sql语句

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写入相应sql语句,写完,你会在左侧发现,有了一个新的数据库,点进去,还可以看到你建的表

完整代码如下:

drop database if exists `my_own_movie_database`;
create database `my_own_movie_database`;

USE `my_own_movie_database`;

CREATE TABLE `movieexec` (
  `name` char(30) DEFAULT NULL,
  `address` varchar(100) DEFAULT NULL,
  `cert` int(11) NOT NULL DEFAULT "0
  ",
  `netWorth` int(11) DEFAULT NULL,
  PRIMARY KEY (`cert`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

#
# Data for table "movieexec"
#

INSERT INTO `movieexec` VALUES ("Calvin Coolidge","Fast Lane",123,20000000),("Merv Griffin","Riot Rd.",199,112000000),("Stephen Spielberg","123 ET road",222,100000000),("Ted Turner","Turner Av.",333,125000000),("George Lucas","Oak Rd.",555,200000000),("Jane Fonda","Turner Av.",567,200000000);

#
# Source for table "movies"
#

CREATE TABLE `studio` (
  `name` char(30) NOT NULL DEFAULT "",
  `address` varchar(100) DEFAULT NULL,
  `presC` int(11) DEFAULT NULL,
  PRIMARY KEY (`name`)
) ;

#
# Data for table "studio"
#

INSERT INTO `studio` VALUES ("MGM","MGM Boulevard",123),("Fox","Fox Boulevard",199),("Disney","Disney Boulevard",222),("USA Entertainm","USA Entertainm Boulevard",333),("Paramount","Paramount Boulevard",555);


CREATE TABLE `movies` (
  `title` char(100) NOT NULL DEFAULT "",
  `year` int(11) NOT NULL DEFAULT "0",
  `length` int(11) DEFAULT NULL,
  `movieType` char(10) DEFAULT NULL,
  `studioName` char(30) ,
  `producerC` int(11) DEFAULT NULL,
  PRIMARY KEY (`title`,`year`),
 foreign key(studioName) references studio(name) on delete cascade
) ;

#
# Data for table "movies"
#

INSERT INTO `movies` VALUES ("Empire Strikes Back",1980,111,"drama","Fox",555),("Gone With the Wind",1938,null,"drama","MGM",123),("Logan"s run",1977,120,"drama","MGM",888),("Pretty Woman",1990,119,"drama","Disney",999),("Star Trek",1979,132,"sciFic","Paramount",444),("Star Trek: Nemesis",2002,116,"sciFic","Paramount",321),("Star Wars",1977,124,"sciFic","Fox",555),("Terms of Endearment",1983,132,"drama","MGM",123),("The Man Who Wasn"t There",2001,116,"comedy","USA Entertainm",777),("The Usual Suspects",1995,106,"drama","MGM",999);

#
# Source for table "moviestar"
#


CREATE TABLE `moviestar` (
  `name` char(30) NOT NULL DEFAULT "",
  `address` varchar(255) DEFAULT NULL,
  `gender` char(1) DEFAULT NULL,
  `birthdate` date DEFAULT NULL,
  PRIMARY KEY (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
#
# Data for table "moviestar"
#
INSERT INTO `moviestar` VALUES ("Alec Baldwin","Baldwin Av.","M","1977-06-07"),("Debra Winger","A way","F","1978-05-06"),("Harrison Ford","Prefect Rd.","M","1955-05-05"),("Jack Nicholson""s","X path","M","1949-05-05"),("Jane Fonda","Turner Av.","F","1977-07-07");
#
# Source for table "starsin"
#
CREATE TABLE `starsin` (
  `movieTitle` char(100) NOT NULL DEFAULT "",
  `movieYear` int(11) NOT NULL DEFAULT "0",
  `starName` char(30) NOT NULL DEFAULT "",
  PRIMARY KEY (`movieTitle`,`movieYear`,`starName`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

#
# Data for table "starsin"
#

INSERT INTO `starsin` VALUES ("Empire Strikes Back",1980,"Harrison Ford"),("Star Wars",1977,"Carrie Fisher"),("Star Wars",1977,"Harrison Ford"),("Star Wars",1977,"Mark Hamill"),("Terms of Endearment",1983,"Debra Winger"),("Terms of Endearment",1983,"Jack Nicholson"),("The Usual Suspects",1995,"Kevin Spacey");

#
# Source for table "studio"
#

4.插入数据 INSERT

基本写法:

INSERT INTO 表名1 VALUES (数据1,数据2,数据3.....),(数据1,数据2......)....;


最后,运行,快捷键:Ctrl +Shift+Enter
(这个地方我愣是到这门课都快学完了,才知道怎么运行…哭死了,前半学期装不上软件,后半学期天天迷为什么建不了表…)
建完表之后,可以看到,表中的内容

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