数据库练习经典表‘dept’+‘emp’的sql语句

1 create table emp ( 2     empno numeric(4) not null, 3     ename varchar(10), 4     job varchar(9), 5     mgr numeric(4), 6     hiredate datetime, 7     sal numeric(7, 2), 8     comm numeric(7, 2), 9     deptno numeric(2)10 );11 12 insert into emp values (7369, 'SMITH', 'CLERK', 7902, '1980-12-17', 800, null, 20);13 insert into emp values (7499, 'ALLEN', 'SALESMAN', 7698, '1981-02-20', 1600, 300, 30);14 insert into emp values (7521, 'WARD', 'SALESMAN', 7698, '1981-02-22', 1250, 500, 30);15 insert into emp values (7566, 'JONES', 'MANAGER', 7839, '1981-04-02', 2975, null, 20);16 insert into emp values (7654, 'MARTIN', 'SALESMAN', 7698, '1981-09-28', 1250, 1400, 30);17 insert into emp values (7698, 'BLAKE', 'MANAGER', 7839, '1981-05-01', 2850, null, 30);18 insert into emp values (7782, 'CLARK', 'MANAGER', 7839, '1981-06-09', 2450, null, 10);19 insert into emp values (7788, 'SCOTT', 'ANALYST', 7566, '1982-12-09', 3000, null, 20);20 insert into emp values (7839, 'KING', 'PRESIDENT', null, '1981-11-17', 5000, null, 10);21 insert into emp values (7844, 'TURNER', 'SALESMAN', 7698, '1981-09-08', 1500, 0, 30);22 insert into emp values (7876, 'ADAMS', 'CLERK', 7788, '1983-01-12', 1100, null, 20);23 insert into emp values (7900, 'JAMES', 'CLERK', 7698, '1981-12-03', 950, null, 30);24 insert into emp values (7902, 'FORD', 'ANALYST', 7566, '1981-12-03', 3000, null, 20);25 insert into emp values (7934, 'MILLER', 'CLERK', 7782, '1982-01-23', 1300, null, 10);26 27 create table dept (28     deptno numeric(2),29     dname varchar(14),30     loc varchar(13)31 );32 33 insert into dept values (10, 'ACCOUNTING', 'NEW YORK');34 insert into dept values (20, 'RESEARCH', 'DALLAS');35 insert into dept values (30, 'SALES', 'CHICAGO');36 insert into dept values (40, 'OPERATIONS', 'BOSTON');37 38 create table bonus (39     empno numeric(4),40     job varchar(9),41     sal numeric,42     comm numeric43 );44 45 create table salgrade (46     grade numeric,47     losal numeric,48     hisal numeric49 );50 51 insert into salgrade values (1, 700, 1200);52 insert into salgrade values (2, 1201, 1400);53 insert into salgrade values (3, 1401, 2000);54 insert into salgrade values (4, 2001, 3000);55 insert into salgrade values (5, 3001, 9999);