Oracle经典建表语句【scott建表】

Oracle经典建表语句【scott建表】
 ==========================================
create table EMP
(
EMPNO NUMBER(4) PRIMARY KEY,
ENAME VARCHAR2(10),
JOB VARCHAR2(9),
MGR NUMBER(4),
HIREDATE DATE,
SAL NUMBER(7,2),
COMM NUMBER(7,2),
DEPNO NUMBER(4)
);

CREATE TABLE Dept(
DEPTNO NUMBER(4),
DNAME VARCHAR2(14),
LOC VARCHAR2(13)
);

CREATE TABLE Salgrade
(
GRADE NUMBER,
LOSAL  NUMBER,
HISAL NUMBER 
);

CREATE TABLE Bonus
(
ENAME VARCHAR(10),
JOB VARCHAR2(9),
SAL NUMBER,
COMM NUMBER
);

INSERT INTO Dept VALUES (10,'财务处','纽约');
INSERT INTO Dept VALUES (20,'发展部','达拉斯');
INSERT INTO Dept VALUES (30,'销售部','芝加哥');
INSERT INTO Dept VALUES (40,'市场开拓部','波士顿');
SELECT * FROM DEPT;

INSERT INTO EMP VALUES
(7369,'史密斯','秘书',7902,to_date('17-12-1980','dd-mm-yyyy'),800,null,20);
INSERT INTO EMP VALUES
(7499,'艾伦','销售员',7698,to_date('20-2-1981','dd-mm-yyyy'),1600,300,30);
INSERT INTO EMP VALUES
(7521,'沃尔德','销售员',7698,to_date('22-2-1981','dd-mm-yyyy'),1250,500,30);
INSERT INTO EMP VALUES
(7566,'琼斯','经理',7839,to_date('2-4-1981','dd-mm-yyyy'),2975,NULL,20);
INSERT INTO EMP VALUES
(7654,'马丁','销售员',7698,to_date('28-9-1981','dd-mm-yyyy'),1250,1400,30);
INSERT INTO EMP VALUES
(7698,'布莱克','经理',7839,to_date('1-5-1981','dd-mm-yyyy'),2850,NULL,30);
INSERT INTO EMP VALUES
(7782,'克拉克','总经理',7839,to_date('9-6-1981','dd-mm-yyyy'),2450,NULL,10);
INSERT INTO EMP VALUES
(7839,'金','主席',NULL,to_date('17-11-1981','dd-mm-yyyy'),5000,NULL,10);
INSERT INTO EMP VALUES
(7844,'唐纳','销售员',7698,to_date('8-9-1981','dd-mm-yyyy'),1500,0,30);
INSERT INTO EMP VALUES
(7900,'詹姆斯','秘书',7698,to_date('3-12-1981','dd-mm-yyyy'),950,NULL,30);
INSERT INTO EMP VALUES
(7902,'福尔德','分析师',7566,to_date('3-12-1981','dd-mm-yyyy'),3000,NULL,20);
INSERT INTO EMP VALUES
(7934,'米勒','秘书',7782,to_date('23-1-1982','dd-mm-yyyy'),1300,NULL,10);
select * from emp;

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);
select * from salgrade;

commit;

 ==========================================
--外键约束
CREATE TABLE QQ(
    GARDE NUMBER(3) PRIMARY KEY,
    GNAME VARCHAR2(20)
);
CREATE TABLE FIREND(
    FID NUMBER(3),
    NAME VARCHAR2(20),
    GRADE NUMBER(3),
    FOREIGN KEY(GRADE) REFERENCES QQ(GARDE) ON DELETE CASCADE
);
 
 
 

创表时建立外键:
  FOREIGN KEY(列名) REFERENCES  引用外键表名(列名) ON DELETE CASCADE

创表后添加外键:
alter TABLE 表名 ADD constraint   外键约束名 FOREIGN KEY(列名) REFERENCES   引用外键表(列名) 
ON UPDATE RESTRICT    //同步更新
ON DELETE RESTRICT  //  同步删除;
 ==========================================
oracle实现主键id自增

  -- 建立表 CREATE TABLE t_module (     module_id   INT NOT NULL ,     module_code   varchar(32) NOT NULL,     module_name   varchar(32) NOT NULL,     isnew   INT DEFAULT  0 ,   PRIMARY KEY (module_id) ) --  为 表 建立 序列 -- 从1 开始, 每次 加1 CREATE SEQUENCE SEQ_MODULE START WITH 1 INCREMENT BY 1;  --查询 下一个 id  select seq_module.nextval from dual  ==========================================