Oracle SQL-database queries, modeling, and optimization.

Example

SELECT employee_id, first_name FROM employees WHERE department_id = 10;

Scenario

Used by business analysts to retrieve specific information about employees in a particular department for reporting purposes.

Example

UPDATE employees SET salary = salary * 1.10 WHERE employee_id = 123;

Scenario

Used by HR departments to apply a salary increase to an employee, demonstrating Oracle SQL's ability to modify data.

Example

CREATE TABLE departments (department_id NUMBER PRIMARY KEY, department_name VARCHAR2(50));

Scenario

Used by database administrators to define and structure new departments within an organization, illustrating the schema design capabilities of Oracle SQL.

Example

GRANT SELECT ON employees TO hr_view;

Scenario

Used to manage access permissions, allowing specific users or roles to view but not modify employee data, thereby enforcing security and data integrity.

Example

BEGIN UPDATE accounts SET balance = balance - 100 WHERE account_id = 1; UPDATE accounts SET balance = balance + 100 WHERE account_id = 2; COMMIT;

Scenario

Used in financial applications to ensure that money transfers are atomic, consistent, isolated, and durable (ACID properties), preventing data anomalies.