We have considered “EMP”, “DEPT” and “SALGRADE” Oracle SCOTT user tables.

create table dept(
  deptno number(2,0),
  dname  varchar2(14),
  loc    varchar2(13),
  constraint dept_pk primary key (deptno)
);
 
create table emp(
  empno    number(4,0),
  ename    varchar2(10),
  job      varchar2(9),
  mgr      number(4,0),
  hiredate date,
  sal      number(7,2),
  comm     number(7,2),
  deptno   number(2,0),
  constraint emp_pk primary key (empno),
  constraint deptno_fk foreign key (deptno) references dept (deptno)
);

create table salgrade(
  grade number,
  losal number,
  hisal number
);


/* Insert into dept table */
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 table */
insert into emp
values(
 7839, 'KING', 'PRESIDENT', null, to_date('17-11-1981','dd-mm-yyyy'), 5000, null, 10
);
insert into emp
values(
 7698, 'BLAKE', 'MANAGER', 7839, to_date('1-5-1981','dd-mm-yyyy'), 2850, null, 30
);
insert into emp
values(
 7782, 'CLARK', 'MANAGER', 7839, to_date('9-6-1981','dd-mm-yyyy'), 2450, null, 10
);
insert into emp
values(
 7566, 'JONES', 'MANAGER', 7839, to_date('2-4-1981','dd-mm-yyyy'), 2975, null, 20
);
insert into emp
values(
 7788, 'SCOTT', 'ANALYST', 7566, to_date('13-JUL-87','dd-mm-rr') - 85, 3000, null, 20
);
insert into emp
values(
 7902, 'FORD', 'ANALYST', 7566, to_date('3-12-1981','dd-mm-yyyy'), 3000, null, 20
);
insert into emp
values(
 7369, 'SMITH', 'CLERK', 7902, to_date('17-12-1980','dd-mm-yyyy'), 800, null, 20
);
insert into emp
values(
 7499, 'ALLEN', 'SALESMAN', 7698, to_date('20-2-1981','dd-mm-yyyy'), 1600, 300, 30
);
insert into emp
values(
 7521, 'WARD', 'SALESMAN', 7698, to_date('22-2-1981','dd-mm-yyyy'), 1250, 500, 30
);
insert into emp
values(
 7654, 'MARTIN', 'SALESMAN', 7698, to_date('28-9-1981','dd-mm-yyyy'), 1250, 1400, 30
);
insert into emp
values(
 7844, 'TURNER', 'SALESMAN', 7698, to_date('8-9-1981','dd-mm-yyyy'), 1500, 0, 30
);
insert into emp
values(
 7876, 'ADAMS', 'CLERK', 7788, to_date('13-JUL-87', 'dd-mm-rr') - 51, 1100, null, 20
);
insert into emp
values(
 7900, 'JAMES', 'CLERK', 7698, to_date('3-12-1981','dd-mm-yyyy'), 950, null, 30
);
insert into emp
values(
 7934, 'MILLER', 'CLERK', 7782, to_date('23-1-1982','dd-mm-yyyy'), 1300, null, 10
);
 

/* Insert into salgrade table */
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);
 
commit;

Converting Oracle “EMP”, “DEPT” and “SALGRADE” tables to PostgreSQL

create table dept(
  deptno integer,
  dname  character varying(14),
  loc    character varying(13),
  constraint dept_pk primary key (deptno)
);
 
create table emp(
  empno    integer,
  ename    character varying(10),
  job      character varying(9),
  mgr      integer,
  hiredate date,
  sal      numeric(7,2),
  comm     numeric(7,2),
  deptno   integer,
  constraint emp_pk primary key (empno),
  constraint deptno_fk foreign key (deptno) references dept (deptno)
);

create table salgrade(
  grade integer,
  losal numeric(7,2),
  hisal numeric(7,2)
);


/* Insert into dept table */
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 table */
insert into emp
values(
 7839, 'KING', 'PRESIDENT', null, to_date('17-11-1981','dd-mm-yyyy'), 5000, null, 10
);
insert into emp
values(
 7698, 'BLAKE', 'MANAGER', 7839, to_date('1-5-1981','dd-mm-yyyy'), 2850, null, 30
);
insert into emp
values(
 7782, 'CLARK', 'MANAGER', 7839, to_date('9-6-1981','dd-mm-yyyy'), 2450, null, 10
);
insert into emp
values(
 7566, 'JONES', 'MANAGER', 7839, to_date('2-4-1981','dd-mm-yyyy'), 2975, null, 20
);
insert into emp
values(
 7788, 'SCOTT', 'ANALYST', 7566, to_date('13-07-87','dd-mm-rr') - 85, 3000, null, 20
);
insert into emp
values(
 7902, 'FORD', 'ANALYST', 7566, to_date('3-12-1981','dd-mm-yyyy'), 3000, null, 20
);
insert into emp
values(
 7369, 'SMITH', 'CLERK', 7902, to_date('17-12-1980','dd-mm-yyyy'), 800, null, 20
);
insert into emp
values(
 7499, 'ALLEN', 'SALESMAN', 7698, to_date('20-2-1981','dd-mm-yyyy'), 1600, 300, 30
);
insert into emp
values(
 7521, 'WARD', 'SALESMAN', 7698, to_date('22-2-1981','dd-mm-yyyy'), 1250, 500, 30
);
insert into emp
values(
 7654, 'MARTIN', 'SALESMAN', 7698, to_date('28-9-1981','dd-mm-yyyy'), 1250, 1400, 30
);
insert into emp
values(
 7844, 'TURNER', 'SALESMAN', 7698, to_date('8-9-1981','dd-mm-yyyy'), 1500, 0, 30
);
insert into emp
values(
 7876, 'ADAMS', 'CLERK', 7788, to_date('13-07-87', 'dd-mm-rr') - 51, 1100, null, 20
);
insert into emp
values(
 7900, 'JAMES', 'CLERK', 7698, to_date('3-12-1981','dd-mm-yyyy'), 950, null, 30
);
insert into emp
values(
 7934, 'MILLER', 'CLERK', 7782, to_date('23-1-1982','dd-mm-yyyy'), 1300, null, 10
);
 

/* Insert into salgrade table */
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);
 
commit;