Bluechip Corporate Investment Centre Interview Questions and Answers

Triggers are database objects that are automatically executed or fired when certain events occur in a database.

• Triggers can be used to enforce business rules, validate data, or automate tasks in a database.

• Examples of triggers include 'BEFORE INSERT' triggers that validate data before inserting into a table, or 'AFTER UPDATE' triggers that perform actions after a record is updated.

SQL queries can extract and summarize data from tables to generate insightful reports for analysis and decision-making.

• SELECT Statement: Use SELECT to specify columns to retrieve, e.g., SELECT name, age FROM users;

• JOIN Operations: Combine data from multiple tables, e.g., SELECT orders.id, users.name FROM orders JOIN users ON orders.user_id = users.id;

• GROUP BY Clause: Aggregate data, e.g., SELECT COUNT(*), status FROM o...read more