mysql数据库练习sql语句用到的emp与dept表结构和数据

DROP TABLE IF EXISTS `dept`;CREATE TABLE `dept` (`DEPTNO` int(2) NOT NULL,`DNAME` varchar(14) DEFAULT NULL,`LOC` varchar(13) DEFAULT NULL,PRIMARY KEY (`DEPTNO`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;-- ------------------------------ Records of 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');-- ------------------------------ Table structure for `emp`-- ----------------------------DROP TABLE IF EXISTS `emp`;CREATE TABLE `emp` (`EMPNO` int(4) NOT NULL,`ENAME` varchar(10) DEFAULT NULL,`JOB` varchar(9) DEFAULT NULL,`MGR` int(4) DEFAULT NULL,`HIREDATE` date DEFAULT NULL,`SAL` int(7) DEFAULT NULL,`COMM` int(7) DEFAULT NULL,`DEPTNO` int(2) DEFAULT NULL,PRIMARY KEY (`EMPNO`),KEY `FK_DEPTNO` (`DEPTNO`),CONSTRAINT `FK_DEPTNO` FOREIGN KEY (`DEPTNO`) REFERENCES `dept` (`DEPTNO`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;-- ------------------------------ Records of emp-- ----------------------------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` 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');