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

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 attempt to unravel those questions himself/herself ahead of checking the solutions.

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Answer: Join Database Interview Question-41. Which of the following SQL clauses is used to sort a result set? SORT ORDER BY ARRANGE SORTED BY Answer: B Database Interview Question-42. The FROM SQL keyword is used to A. Specify the table we are modifying. B. Specify the table we are inserting data in. C. Specify the table we are selecting or deleting from. Answer: C Database Interview Question-43. What does ACID stand for? A. Access. Constraint. Index. Data. B. Atomicity. Consistency. Isolation.

Answer: WHERE clause cannot be used with aggregates, but the HAVING clause can be used. WHERE is less expensive than that of HAVING Database Interview Question-30. Write a simple Stored Procedure. Answer: Here is a sample stored procedure CREATE PROCEDURE GetEmployeenameEmailInOutputVariable ( @ID INT, --Input parameter @NAME VARCHAR (200) OUT, -- Output parameter to collect name @EMAIL VARCHAR (200)OUT -- Output Parameter to collectemail ) AS BEGIN SELECT @NAME= Firstname+' '+Lastname, @EMAIL=EMAIL FROM EMPLOYEE WHERE ID=@ID END Database Interview Question-31.

What all constraints are supported by MYSQL? Answer: We have the following constraints: A. NOT NULL – The constraint ensures that a column cannot store NULL value B. UNIQUE - The constraint ensures that column cannot have duplicate value C. PRIMARY KEY – This constraint is combination of UNIQUE and NOT NULL D. FOREIGN KEY – This constraint ensures that referential integrity among multiple table is maintained E. CHECK - This constraint ensures that the value in a column meets a specific condition F.

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