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CREATING a Simple Example Database 
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The following SQL statements create and populate four tables: Emp,
Dept, Bonus and Salgrade. The Bouns table is deliberately empty. The
example database is based on a public example database from Oracle.

DROP TABLE Emp;
DROP TABLE Dept;
DROP TABLE Bonus;
DROP TABLE Salgrade;

CREATE TABLE Emp
       (EMPNO INTEGER NOT NULL,
        ENAME VARCHAR(10),
        JOB VARCHAR(9),
        MGR INTEGER,
        HIREDATE DATE,
        SAL NUMERIC(7, 2),
        COMM NUMERIC(7, 2),
        DEPTNO INTEGER);

INSERT INTO Emp VALUES
        (7369, 'SMITH',  'CLERK',     7902,
        '2010-02-11',  800, NULL, 20);
INSERT INTO Emp VALUES
        (7499, 'ALLEN',  'SALESMAN',  7698,
        '2011-02-20', 1600,  300, 30);
INSERT INTO Emp VALUES
        (7521, 'WARD',   'SALESMAN',  7698,
        '2011-02-22', 1250,  500, 30);
INSERT INTO Emp VALUES
        (7566, 'JONES',  'MANAGER',   7839,
        '2011-04-02',  2975, NULL, 20);
INSERT INTO Emp VALUES
        (7654, 'MARTIN', 'SALESMAN',  7698,
       '2011-09-28', 1250, 1400, 30);
INSERT INTO Emp VALUES
        (7698, 'BLAKE',  'MANAGER',   7839,
        '2009-05-20',  2850, NULL, 30);
INSERT INTO Emp VALUES
        (7782, 'CLARK',  'MANAGER',   7839,
        '2011-02-01',  2450, NULL, 10);
INSERT INTO Emp VALUES
        (7788, 'SCOTT',  'ANALYST',   7566,
        '2008-05-16', 3000, NULL, 20);
INSERT INTO Emp VALUES
        (7839, 'KING',   'PRESIDENT', NULL,
        '2008-05-01', 5000, NULL, 10);
INSERT INTO Emp VALUES
        (7844, 'TURNER', 'SALESMAN',  7698,
        '2008-08-16',  1500,    0, 30);
INSERT INTO Emp VALUES
        (7876, 'ADAMS',  'CLERK',     7788,
        '2008-09-11', 1100, NULL, 20);
INSERT INTO Emp VALUES
        (7900, 'JAMES',  'CLERK',     7698,
        '2008-05-16',   950, NULL, 30);
INSERT INTO Emp VALUES
        (7902, 'FORD',   'ANALYST',   7566,
        '2009-07-01',  3000, NULL, 20);
INSERT INTO Emp VALUES
        (7934, 'MILLER', 'CLERK',     7782,
        '2009-08-01', 1300, NULL, 10);

CREATE TABLE Dept
       (DEPTNO INTEGER,
        DNAME VARCHAR(14),
        LOC VARCHAR(13) );

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');

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

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

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);