-
mysql数据库创建，表创建模等模板脚本
-- 用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mysql的sql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;
-
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
