What are some common SQL interview questions?
An example of an AI chatbot conversation about SQL interview questions and answers.
What are some common SQL interview questions I should prepare for?
Some common SQL interview questions include:
- What is SQL?
- Explain the difference between INNER JOIN and LEFT JOIN.
- How do you optimize a SQL query?
- What are indexes and how do they work?
- Can you explain normalization and denormalization?
Can you explain the difference between INNER JOIN and LEFT JOIN?
Sure! An INNER JOIN returns only the rows that have matching values in both tables, while a LEFT JOIN returns all rows from the left table and the matched rows from the right table. If there is no match, NULL values are returned for columns from the right table.
What is normalization in SQL?
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. It involves dividing a database into tables and defining relationships between them.
How can I optimize a SQL query?
To optimize a SQL query, you can:
- Use indexes to speed up data retrieval.
- Avoid SELECT * and specify only the columns you need.
- Use WHERE clauses to filter data early.
- Analyze query execution plans to identify bottlenecks.
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