首页 > 代码库 > 4.mysql数据库创建,表创建模等模板脚本,mysql_SQL99标准的连接查询(内连接,外连接,满外连接,交叉连接)

4.mysql数据库创建,表创建模等模板脚本,mysql_SQL99标准的连接查询(内连接,外连接,满外连接,交叉连接)


  1. mysql数据库创建,表创建模等模板脚本

--root用户登录系统,执行脚本

 

--创建数据库

create database mydb61 character set utf8 ;

 

--选择数据库

use mydb61;

 

--增加 dbuser1用户

--    创建用户‘dbuser61’密码为dbuser61’拥有操作数据库mydb61的所有权限

        GRANT ALL ON mydb61.* TO dbuser61 IDENTIFIED BY "dbuser61";

        flush privileges;

 

-- grant select,insert,update,delete on mydb61.* to dbuser61@localhost identified by "dbuser61";

-- grant select,insert,update,delete on mydb61.* to dbuser61@‘%‘ identified by "dbuser61";

 

--创建表

 

--创建部门表并赋值

DROP TABLE IF EXISTS `dept`;

CREATE TABLE `dept`(

        `deptno`     int(2) PRIMARY KEY,

       `dname`       varchar(14) NOT NULL,

       `loc`        varchar(13)

)DEFAULT CHARSET=utf8;

 

INSERT INTO dept VALUES(10, ‘ACCOUNTING‘, ‘NEW YORK‘);

INSERT INTO dept VALUES(20, ‘RESEARCH‘, ‘DALLAS‘);

INSERT INTO dept VALUES(30, ‘SALES‘, ‘CHICAGO‘);

INSERT INTO dept VALUES(40, ‘OPERATIONS‘, ‘BOSTON‘);

 

commit;

 

--注意mysqlsql语言约束如果起名字,需要单独写在表后面

--创建员工表并赋值

DROP TABLE IF EXISTS `emp`;

CREATE TABLE `emp`(

        -- `empno`           int(4) constraint emp_empno_pk PRIMARY KEY,

        `empno`           int(4) PRIMARY KEY,

        `ename`                  varchar(10) NOT NULL,

        `job`            varchar(9),

        `mgr`                    int(4),

        `hiredate`         DATE,

        `sal`            int ,

        `comm`                  int,

        `deptno`           int(2) ,

        constraint emp_deptno_fk  foreign key(deptno) references dept(deptno)

)DEFAULT CHARSET=utf8;

 

--创建索引

-- CREATE INDEX MYSCOTT.IX_CAtbAuditOperInfo_OT ON MYSCOTT.EMP(ENAME) TABLESPACE ts_myscott2;

create index emp_ename_index on emp(ename);

 

--注意日期格式不一样

INSERT INTO emp VALUES(7369, ‘SMITH‘, ‘CLERK‘, 7902, ‘1980-12-17‘, 800, NULL, 20);

INSERT INTO emp VALUES(7499, ‘ALLEN‘, ‘SALESMAN‘, 7698, ‘1981-02-20‘, 1600, 300, 30);

-- INSERT INTO emp(empno, ename, job, mgr, hiredate, sal, deptno) VALUES(7499, ‘ALLEN‘, ‘SALESMAN‘, 7698, ‘1981-02-20‘, 1600, 30);

INSERT INTO emp VALUES(7521, ‘WARD‘, ‘SALESMAN‘, 7698, ‘1981-02-22‘, 1250, 500, 30);           

INSERT INTO emp VALUES(7566, ‘JONES‘, ‘MANAGER‘, 7839, ‘1981-04-02‘, 2975, NULL, 20);

INSERT INTO emp VALUES(7654, ‘MARTIN‘, ‘SALESMAN‘, 7698, ‘1981-09-28‘, 1250, 1400, 30);

INSERT INTO emp VALUES(7698, ‘BLAKE‘, ‘MANAGER‘, 7839, ‘1981-05-01‘, 2850, NULL, 30);

           

INSERT INTO emp VALUES(7782, ‘CLARK‘, ‘MANAGER‘, 7839, ‘1981-06-09‘, 2450, NULL, 10);

INSERT INTO emp VALUES(7788, ‘SCOTT‘, ‘ANALYST‘, 7566, ‘1987-04-19‘, 3000, NULL, 20);

INSERT INTO emp VALUES(7839, ‘KING‘, ‘PRESIDENT‘, NULL, ‘1981-11-17‘, 5000, NULL, 10);

           

INSERT INTO emp VALUES(7844, ‘TURNER‘, ‘SALESMAN‘, 7698, ‘1981-09-08‘, 1500, 0, 30);

INSERT INTO emp VALUES(7876, ‘ADAMS‘, ‘CLERK‘, 7788, ‘1987-05-23‘, 1100, NULL, 20);

INSERT INTO emp VALUES(7900, ‘JAMES‘, ‘CLERK‘, 7698, ‘1981-12-03‘, 950, NULL, 30);

           

INSERT INTO emp VALUES(7902, ‘FORD‘, ‘ANALYST‘, 7566, ‘1981-12-03‘, 3000, NULL, 20);

INSERT INTO emp VALUES(7934, ‘MILLER‘, ‘CLERK‘, 7782, ‘1982-01-23‘, 1300, NULL, 10);

commit;

 

--创建工资级别表并赋值

DROP TABLE IF EXISTS `salgrade`;

CREATE TABLE `salgrade`(

       `grade`             int,

       `losal`           int,

       `hisal`           int

)DEFAULT CHARSET=utf8;

 

INSERT INTO salgrade VALUES(1, 700, 1200);

INSERT INTO salgrade VALUES(2, 1201, 1400);

INSERT INTO salgrade VALUES(3, 1401, 2000);

INSERT INTO salgrade VALUES(4, 2001, 3000);

INSERT INTO salgrade VALUES(5, 3001, 9999);

commit;

 

--创建奖金表

DROP TABLE IF EXISTS `bonus`;

CREATE TABLE bonus(

        `ename`      VARCHAR(10),

       `job`       VARCHAR(9),

       `sal`            int,

       `comm`      int

)DEFAULT CHARSET=utf8;

 

commit;

 

  1. mysql_SQL99标准的连接查询(内连接,外连接,满外连接,交叉连接)

使用SQL99标准的连接查询(JOIN..ON..

        内连接(innerjoin等价于oracle中的“逗号”,下面的on替换掉了where

                  只返回满足连接条件的数据(两边都有的才显示)。

Mysql

Oracle

        select e.*, d.*

                  from emp e

                  inner join dept d

                  on e.deptno=d.deptno

select e.*, d.*

                  from emp e, dept d

                  where e.deptno=d.deptno;

--也可以省略inner关键字。

 

        左外连接

                  左边有值才显示。

Mysql

Oracle

select e.*, d.*

                  from emp e

                  left outer join dept d

                  on e.deptno=d.deptno

select e.*, d.*

                  from emp e

                  , dept d

                  where e.deptno=d.deptno(+)

--也可以省略outer关键字

 

        右外连接

                  右边边有值才显示。

Mysql

Oracle

select e.*, d.*

                  from emp e               

                  right outer join dept d

                  on e.deptno=d.deptno

select e.*, d.*

                  from emp e

                  , dept d

                  where e.deptno(+)=d.deptno

--也可以省略outer关键字

 

        满外联接

                  任一边有值就会显示。

                  selecte.*, d.*

                  fromemp e

                  fullouter join dept d                 

                  one.deptno=d.deptno

                  --也可以省略outer关键字

        

        交叉连接:

                  叉集,就是笛卡尔积

                  selecte.*, d.*

                  fromemp e

                  crossjoin dept d

                  --没有连接条件

 

eg:查询员工信息,员工号,姓名,月薪,部门名称

        select e.empno, e.ename, e.sal, d.dname

        from emp e, dept d

        where e.deptno=d.deptno

 

        select e.empno, e.ename, e.sal, d.dname

        from emp e inner join dept d  -- 逗号join

       on e.deptno=d.deptno    -- where on

 

//显示所有部门信息

//显示各个部门的部门人数

        select d.deptno 部门号, d.dname部门名称,count(e.empno)人数

        from emp e, dept d

        where e.deptno(+)=d.deptno

        group by d.deptno, d.dname

 

        select d.deptno 部门号, d.dname部门名称,count(e.empno)人数

        from emp e right outer join dept d

        on e.deptno=d.deptno

        group by d.deptno, d.dname

 

自连接: --查询员工信息 ,老板信息

        显示:  ****的老板是****

select e.ename , b.ename

        from emp e, emp b

        where e.mgr=b.empno

 

select concat ( concat(e.ename, ‘的老板是‘), b.ename)

        from emp e, emp b

        where e.mgr=b.empno

 

select e.ename, ifnull(b.ename,‘他自己‘)

        from emp e left outer join emp b

        on e.mgr=b.empno

 

select concat ( concat(e.ename, ‘的老板是‘), ifnull(b.ename,‘他自己‘))

        from emp e left outer join emp b

        on e.mgr=b.empno

+------------------------------------------------------------------------+

| concat ( concat(e.ename, ‘的老板是‘), ifnull(b.ename,‘他自己‘))       |

+------------------------------------------------------------------------+

| SMITH的老板是FORD                                                     |

| ALLEN的老板是BLAKE                                                    |

| WARD的老板是BLAKE                                                     |

| JONES的老板是KING                                                     |

| MARTIN的老板是BLAKE                                                   |

| BLAKE的老板是KING                                                     |

| CLARK的老板是KING                                                     |

| SCOTT的老板是JONES                                                    |

| KING的老板是他自己                                                    |

| TURNER的老板是BLAKE                                                   |

| ADAMS的老板是SCOTT                                                    |

| JAMES的老板是BLAKE                                                    |

| FORD的老板是JONES                                                     |

| MILLER的老板是CLARK                                                   |

+------------------------------------------------------------------------+

 

aaaaddd   ccccbbbbbb

aaaaddd   ccccbbbbbb

aaaaddd   ccccbbbbbb

aaaaddd   ccccbbbbbb

 

方法:按住alt键以后,鼠标拖动,选中一个矩形区域

 

 

4.mysql数据库创建,表创建模等模板脚本,mysql_SQL99标准的连接查询(内连接,外连接,满外连接,交叉连接)