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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）

2014-10-15 12:03 671 查看

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 full outer 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 ccccbbbbbbaaaaddd ccccbbbbbbaaaaddd ccccbbbbbbaaaaddd ccccbbbbbb 方法:按住alt键以后,鼠标拖动,选中一个矩形区域

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