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Oracle Tutorial

Hello World


SELECT 'Hello world!' FROM dual;

In Oracle's flavor of SQL, "dual is just a convienence table". It was originally intended to double rows via a JOIN, but now contains one row with a DUMMY value of 'X'.

SQL Query


List employees earning more than $50000 born this century. List their name, date of birth and salary, sorted alphabetically by name.

SELECT employee_name, date_of_birth, salary
FROM employees
WHERE salary > 50000
 AND date_of_birth >= DATE '2000-01-01'
ORDER BY employee_name;

Show the number of employees in each department with at least 5 employees. List the largest departments first.

SELECT department_id, COUNT(*)
FROM employees
GROUP BY department_id
HAVING COUNT(*) >= 5
ORDER BY COUNT(*) DESC;


Conclusion

In this page (written and validated by ) you learned about Oracle Tutorial . What's Next? If you are interested in completing Oracle tutorial, your next topic will be learning about: Oracle Hello world from table.



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