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Forwarded from Python Resources TP
Calendar in Python๐Ÿ˜ธ
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Forwarded from SQL Resources TP
Here are the SQL interview questions:

Basic SQL Questions

1.โ  โ What is SQL, and what is its purpose?
2.โ  โ Write a SQL query to retrieve all records from a table.
3.โ  โ How do you select specific columns from a table?
4.โ  โ What is the difference between WHERE and HAVING clauses?
5.โ  โ How do you sort data in ascending/descending order?

SQL Query Questions

1.โ  โ Write a SQL query to retrieve the top 10 records from a table based on a specific column.
2.โ  โ How do you join two tables based on a common column?
3.โ  โ Write a SQL query to retrieve data from multiple tables using subqueries.
4.โ  โ How do you use aggregate functions (SUM, AVG, MAX, MIN)?
5.โ  โ Write a SQL query to retrieve data from a table for a specific date range.

SQL Optimization Questions

1.โ  โ How do you optimize SQL query performance?
2.โ  โ What is indexing, and how does it improve query performance?
3.โ  โ How do you avoid full table scans?
4.โ  โ What is query caching, and how does it work?
5.โ  โ How do you optimize SQL queries for large datasets?

SQL Joins and Subqueries

1.โ  โ Explain the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN.
2.โ  โ Write a SQL query to retrieve data from two tables using a subquery.
3.โ  โ How do you use EXISTS and IN operators in SQL?
4.โ  โ Write a SQL query to retrieve data from multiple tables using a self-join.
5.โ  โ Explain the concept of correlated subqueries.

SQL Data Modeling

1.โ  โ Explain the concept of normalization and denormalization.
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5.โ  โ How do you handle data inconsistencies and anomalies?

SQL Advanced Questions

1.โ  โ Explain the concept of window functions (ROW_NUMBER, RANK, etc.).
2.โ  โ Write a SQL query to retrieve data using Common Table Expressions (CTEs).
3.โ  โ How do you use dynamic SQL?
4.โ  โ Explain the concept of stored procedures and functions.
5.โ  โ Write a SQL query to retrieve data using pivot tables.

SQL Scenario-Based Questions

1.โ  โ You have two tables, Orders and Customers. Write a SQL query to retrieve all orders for customers from a specific region.
2.โ  โ You have a table with duplicate records. Write a SQL query to remove duplicates.
3.โ  โ You have a table with missing values. Write a SQL query to replace missing values with a default value.
4.โ  โ You have a table with data in an incorrect format. Write a SQL query to correct the format.
5.โ  โ You have two tables with different data types for a common column. Write a SQL query to join the tables.

SQL Behavioral Questions

1.โ  โ Can you explain a time when you optimized a slow-running SQL query?
2.โ  โ How do you handle database errors and exceptions?
3.โ  โ Can you describe a complex SQL query you wrote and why?
4.โ  โ How do you stay up-to-date with new SQL features and best practices?
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Hope it helps :)
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