Introduction:
Briefly introduce the importance of Oracle SQL in database management and the significance of being well-prepared for SQL-related interviews.
Commonly Asked Oracle SQL Interview Questions:
Difference Between RANK and DENSE_RANK Functions:
Explanation of both functions and their distinctions.
Purpose of the UNION Operator:
Explanation of how the UNION operator combines query results.
Advantages of Using Indexes:
Discussion on the benefits of using indexes in a database.
Difference Between WHERE and HAVING Clauses:
Clarification on the distinctions between the WHERE and HAVING clauses.
Oracle Query Optimizer:
Explanation of how the Oracle Query Optimizer determines query execution plans.
ROW-level vs. STATEMENT-level Triggers:
Comparison between ROW-level and STATEMENT-level triggers.
Function of COMMIT and ROLLBACK Statements:
Explanation of how COMMIT and ROLLBACK statements affect transactions.
Advantages of Using Bind Variables:
Discussion on the benefits of using bind variables in Oracle SQL.
Difference Between VARCHAR and VARCHAR2 Data Types:
Comparison between VARCHAR and VARCHAR2 data types in Oracle.
Database Roles and Privileges:
Explanation of database roles, privileges, and their management in Oracle SQL.
Oracle SQL Practical Application Questions:
Finding Average Salary by Department:
SQL query to find the average salary of employees within each department.
Identifying Employees Earning More than Managers:
SQL query to find employees who earn more than their managers.
Updating Order Status:
SQL query to update the status column of the orders table based on conditions.
Retrieving User Login Information:
SQL query to retrieve the date and time of the last 10 logins for a specific user.
Finding Top Five Highest-Rated Products:
SQL query to retrieve the top five highest-rated products based on customer reviews.
Calculating Total Revenue by Customer:
SQL query to calculate the total revenue generated by each customer in the last three months.
Determining Percentage Contribution of Products:
SQL query to calculate the percentage of total sales each product contributes to overall revenue.
Finding Employees Not Assigned to Projects:
SQL query to find the names of employees not assigned to any project.
Identifying Most Common Employee Names:
SQL query to find the five most common names in the Employee table.
Enforcing Role-Based Insertion:
SQL trigger to ensure only users with the manager role can insert rows into the performance_reviews table.
Conclusion:
Summarize key points covered in the blog post and encourage readers to practice Oracle SQL interview questions to enhance their skills.
Closing Thoughts:
Offer additional resources or tips for mastering Oracle SQL and preparing for interviews.
