Create table employee and enter employee data in SQL?

Consider the following relational schemas:
EMPLOYEE (EMPLOYEE_NAME, STREET, CITY)
WORKS (EMPLOYEE_NAME, COMPANYNAME, SALARY)
COMPANY (COMPANY_NAME, CITY)
Specify the table definitions in SQL.

Ans. CREATE TABLE EMPLOYEE
( EMPLOYEE_NAME VARCHAR2(20) PRIMARY KEY,
STREET VARCHAR2(20),
CITY VARCHAR2(15));
CREATE TABLE COMPANY
( COMPANY_NAME VARCHAR2(50) PRIMARY KEY,
CITY VARCHAR2(15));
CREATE TABLE WORKS
( EMPLOYEE_NAME VARCHAR2(20)
REFERENCES EMPLOYEE(EMPLOYEE_NAME,
COMPANYNAME VARCHAR2(50)
REFERENCES COMPANY(COMPANY_NAME,
SALARY NUMBER(6),
CONSTRAINT WORKS_PK PRIMARY KEY(EMPLOYEE_NAME,
COMPANY_NAME));