4.mysql数据库创建，表中创建模具模板脚本，mysql_SQL99标准连接查询（恩，外部连接，全外连接,交叉连接）



1. mysql数据库创建，表创建模等模板脚本

--
用root用户登录系统，运行脚本

--
创建数据库

create database mydb61 character set utf8 ;

--
选择数据库

use mydb61;

--
添加 dbuser1
用户

--
    创建用户‘dbuser61’password为
‘dbuser61’拥有操作数据库mydb61的全部权限

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mysql的sql语言
约束假设起名字，须要单独写在表后面

--
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”，以下的on替换掉了where）

仅仅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;

--
也能够省略innerkeyword。

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(+)

--
也能够省略outerkeyword

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

--
也能够省略outerkeyword

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

--也能够省略outerkeyword

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

//显示全部部门信息

//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                                                   
|

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

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方法:按住alt键以后,鼠标拖动,选中一个矩形区域