Here are the most comonly asked concepts in sql interview english
"Here are the most comonly asked concepts in sql interview
🚀Basic SQL Queries:
✅Crafting SELECT statements to retrieve data from single tables.
✅Applying WHERE clause to filter data based on specified conditions.
✅Using ORDER BY clause to sort query results.
🚀Joins:
✅Understanding INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN to combine data from multiple tables based on related columns.
✅Employing joins effectively to merge datasets and extract meaningful insights.
🚀Subqueries:
✅Writing nested queries (subqueries) to retrieve data used within main queries.
✅Differentiating between correlated and non-correlated subqueries and their respective uses.
🚀Window Functions:
✅Using window functions (e.g., ROW_NUMBER(), RANK(), LEAD(), LAG()) to perform calculations across sets of rows related to the current row.
🚀Conditional Logic:
✅Employing CASE statements for conditional logic within queries to categorize data or create derived columns.
🚀Normalization Concepts:
✅Understanding database normalization principles (e.g., First Normal Form, Second Normal Form) for efficient database design and management.
🚀Handling NULL Values:
✅Addressing NULL values in queries using IS NULL and IS NOT NULL operators for accurate data analysis.
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