World Health Organization Data Analyst Interview Questions and Answers

Validations used in project

• Input validation to ensure correct data type and format

• Data validation to ensure data integrity and consistency

• Business rule validation to ensure compliance with requirements

• Authentication and authorization validation to ensure secure access

• Error handling and exception validation to ensure proper handling of errors

Stored procedures are precompiled SQL statements that can be saved and reused in a database.

• Stored procedures can improve performance by reducing network traffic and improving security.

• They can be used to encapsulate business logic and provide a consistent interface to the database.

• Parameters can be passed to stored procedures, allowing for dynamic queries.

• Examples of stored procedures include ones that retrieve data,

Views in SQL are virtual tables that are based on the result of an SQL statement.

• Views are created using the CREATE VIEW statement.

• They can be used to simplify complex queries.

• They can also be used to restrict access to sensitive data.

• Views are updated automatically when the underlying tables are updated.

• They can be used to join multiple tables into a single view.