1.建表语句_后面主要对这些数据进行查询操作

DROP TABLE EMP;
DROP TABLE DEPT;
SELECT * FROM DEPT;
SELECT * FROM EMP;
CREATE TABLE DEPT
(DEPTNO int CONSTRAINT PK_DEPT PRIMARY KEY,
DNAME VARCHAR(14) ,
LOC VARCHAR(13) ) ;

CREATE TABLE EMP
(EMPNO int CONSTRAINT PK_EMP PRIMARY KEY,
ENAME VARCHAR(10),
JOB VARCHAR(9),
MGR int,
HIREDATE DATETIME,
SAL int,
COMM int,
DEPTNO int CONSTRAINT FK_DEPTNO REFERENCES DEPT);

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‘);

INSERT INTO EMP VALUES
(7369,‘SMITH‘,‘CLERK‘,7902, ‘1980-12-17‘,800,NULL,20);
INSERT INTO EMP VALUES
(7499,‘ALLEN‘,‘SALESMAN‘,7698,‘1981-2-20‘,1600,300,30);
INSERT INTO EMP VALUES
(7521,‘WARD‘,‘SALESMAN‘,7698,‘1981-2-22‘,1250,500,30);
INSERT INTO EMP VALUES
(7566,‘JONES‘,‘MANAGER‘,7839,‘1981-4-2‘,2975,NULL,20);
INSERT INTO EMP VALUES
(7654,‘MARTIN‘,‘SALESMAN‘,7698, ‘1981-9-28‘,1250,1400,30);
INSERT INTO EMP VALUES
(7698,‘BLAKE‘,‘MANAGER‘,7839, ‘1981-5-1‘, 2850,NULL,30);
INSERT INTO EMP VALUES
(7782,‘CLARK‘,‘MANAGER‘,7839, ‘1981-9-6‘, 2450,NULL,10);
INSERT INTO EMP VALUES
(7788,‘SCOTT‘,‘ANALYST‘,7566, ‘1987-7--13‘, 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,‘1981-9-8‘,1500,0,30);
INSERT INTO EMP VALUES
(7876,‘ADAMS‘,‘CLERK‘,7788,‘1987-7-13‘,1100,NULL,20);
INSERT INTO EMP VALUES
(7900,‘JAMES‘,‘CLERK‘,7698, ‘1981-12-3‘,950,NULL,30);
INSERT INTO EMP VALUES
(7902,‘FORD‘,‘ANALYST‘,7566, ‘1981-12-3‘,3000,NULL,20);
INSERT INTO EMP VALUES
(7934,‘MILLER‘,‘CLERK‘,7782, ‘1982-1-23‘,1300,NULL,10);
INSERT INTO EMP VALUES
(7948,‘MIKE‘,‘CLERK‘,7934, ‘1982-4-23‘,2700,NULL,10);
INSERT INTO EMP VALUES
(7951,‘OLIVEN‘,‘CLERK‘,7948,‘1982-3-23‘,2100,NULL,10);


CREATE TABLE dept
(
deptno INT PRIMARY KEY NOT NULL,
dname VARCHAR(20) NOT NULL,
loc    VARCHAR(20) NOT NULL
)

CREATE TABLE emp 
(
empno INT PRIMARY KEY NOT NULL,
ename VARCHAR(10) NOT NULL,
job VARCHAR(10) NOT NULL,
MGR INT,
hiredate DATETIME NOT NULL default getDate(),
SAL FLOAT NOT NULL DEFAULT 0,
COMM INT,
deptno foreign key References dept(deptno) 
)