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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）...

發布時間：2025/3/21 数据库 21 豆豆

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mysql數據庫創建，表創建模等模板腳本

-- 用root用戶登錄系統，運行腳本

-- 創建數據庫

create database mydb61 character set utf8 ;

-- 選擇數據庫

use mydb61;

-- 添加 dbuser1 用戶

-- ??? 創建用戶‘dbuser61’password為 ‘dbuser61’擁有操作數據庫mydb61的全部權限

???????? 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";

-- 創建表

-- 創建部門表并賦值

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語言約束假設起名字，須要單獨寫在表后面

-- 創建員工表并賦值

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;

--創建索引

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

create index emp_ename_index on emp(ename);

--注意日期格式不一樣

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;

-- 創建工資級別表并賦值

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;

--創建獎金表

DROP TABLE IF EXISTS `bonus`;

CREATE TABLE bonus(

???????? `ename`????? VARCHAR(10),

??????? `job`?????? VARCHAR(9),

??????? `sal`????? ????? int,

??????? `comm`????? int

)DEFAULT CHARSET=utf8;

commit;

mysql_SQL99標準的連接查詢（內連接。外連接，滿外連接,交叉連接）

使用SQL99標準的連接查詢（JOIN..ON..）

???????? 內連接（innerjoin等價于oracle中的“逗號”，以下的on替換掉了where）

?????????????????? 僅僅返回滿足連接條件的數據（兩邊都有的才顯示）。

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;

-- 也能夠省略innerkeyword。

???????? 左外連接

?????????????????? 左邊有值才顯示。

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(+)

-- 也能夠省略outerkeyword

???????? 右外連接

?????????????????? 右邊邊有值才顯示。

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

-- 也能夠省略outerkeyword

???????? 滿外聯接

?????????????????? 任一邊有值就會顯示。

?????????????????? selecte.*, d.*

?????????????????? fromemp e

?????????????????? fullouter join dept d?????????????????

?????????????????? one.deptno=d.deptno

?????????????????? --也能夠省略outerkeyword

????????

???????? 交叉連接：

?????????????????? 叉集，就是笛卡爾積

?????????????????? selecte.*, d.*

?????????????????? fromemp e

?????????????????? crossjoin dept d

?????????????????? --沒有連接條件

eg:查詢員工信息,員工號,姓名,月薪,部門名稱

???????? 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? -- 逗號join

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

//顯示全部部門信息

//顯示各個部門的部門人數

???????? select d.deptno 部門號, d.dname 部門名稱,count(e.empno) 人數

???????? from emp e, dept d

???????? where e.deptno(+)=d.deptno

???????? group by d.deptno, d.dname

???????? select d.deptno 部門號, d.dname 部門名稱,count(e.empno) 人數

???????? from emp e right outer join dept d

???????? on e.deptno=d.deptno

???????? group by d.deptno, d.dname

自連接: -- 查詢員工信息 ,老板信息

???????? 顯示:?? ****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

方法:按住alt鍵以后,鼠標拖動,選中一個矩形區域

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