Read e-book online Cracking the Coding Interview: 70 Database Questions and PDF

By Chinmoy Mukherjee

We current 70 fascinating database interview questions and solutions for readers to perform and crack any database interview. The reader is inspired to aim to unravel those questions himself/herself earlier than checking the solutions.

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Read Online or Download Cracking the Coding Interview: 70 Database Questions and Answers PDF

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Extra info for Cracking the Coding Interview: 70 Database Questions and Answers

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What does ACID stand for? A. Access. Constraint. Index. Data. B. Atomicity. Consistency. Isolation. Durability. C. Access. Consistency. Isolation. Data. Answer: B Database Interview Question-44. Which of the following SQL statements deletes all rows in table called SalesData? A. DELETE * FROM SalesData B. DELETE FROM SalesData C. DELETE SalesData D. DELETE ALL SalesData Answer: B Database Interview Question-45. Which of the following SQL clauses is used to select data from 2 or more tables? A. HAVING B.

What is a View? Answer: A view is the representation of a SQL statement that is stored in memory so that it can easily be re-used as example CREATE VIEW [MyProductList] AS SELECT ProductID,ProductName FROM Products WHERE Discontinued=No SELECT * FROM [MyProductList] Database Interview Question-12. There is a table “Employee” having two columns – Emp_Name and Office_Locations. Write a query that will display all office locations and the number of employees in each of these locations. Answer: Select Office_Locations, COUNT(Emp_Name) FROM Employee GROUP BY Office_Locations; Database Interview Question-13.

Below figure explains the concept of index pictorially. Database Interview Question-2. When to not use index? Answer: Index should not be used for following cases: � If number of records are small � If records need to be updated/inserted/deleted on a daily basis � If column value can be null very often Database Interview Question-3. What is tempdb? Answer: tempdb is temporary database which can be used by all users/processes to maintain temporary tables, etc. Content of tempdb is erased when database server is restarted.

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Cracking the Coding Interview: 70 Database Questions and Answers by Chinmoy Mukherjee

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