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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


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