Interview Questions and Answers for 'SQL' | Search Interview Question

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Q31. Which is the best NoSql Database for Performance ?

NoSql

Ans. Possible Answer - doument base - monogodb

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Q32. Write a SQL to find 2nd Max value in a Table.

Database

Ans. SELECT MIN(FIELD) FROM (SELECT TOP 2 FIELD FROM TABLE ORDER BY FIELD DESC)

or

SELECT MAX(FIELD) FROM TABLE WHERE FIELD NOT IN (SELECT MAX(FIELD) FROM TABLE)

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Q33. Write a SQL to find max salary by Dept

SQL

Ans. SELECT MAX(SALARY),DEPT FROM EMPLOYEE GROUP BY DEPT

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Q34. Write a SQL to display all duplicate names from Employee Table

SQL

Ans. SELECT * FROM EMPLOYEE A WHERE A.ROW_ID IN (SELECT MAX(ROW_ID) FROM EMPLOYEE b WHERE A.NAME = B.NAME )

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Q35. Write an SQL to get Employees who are also Managers

SQL

Ans. SELECT A.NAME FROM EMPLOYEE A, EMPLOYEE B WHERE A.ID = B.MANAGER_ID

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Q36. What is Left Outer Join ?

Database

Ans. It returns all the rows form the left table and matches the rows in both tables.

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Q37. Describe SQL Joins

Database

Ans. Oracle having following types of joins these are also called 8i joins. There are:

1. Equi (or) Inner join
2. Non Equi join
3.Self join
4.Outer join

Oracle also support the 9i (or) ANSI standard joins.There are:

1.Inner join
2.Left outer join
3.Right outer join
4.Full outer join
5.Natural join

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Q38. What are different in memory data structures that are used in No Sql Database ?

NoSql Database

^{This question is still unanswered. Can you please provide an answer.}

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Q39. What are different types of No Sql Databases ?

NoSql

Ans. graph based
column based
document based

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Q40. Difference between Left and Inner Join ?

SQL

^{This question was recently asked at 'Canopy Tax,Cogent Infotech Corp'.This question is still unanswered. Can you please provide an answer.}

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Q41. Write SQL to get all members and the count of books they have checked out , even the ones that haven't checked out anything.

SQL

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Q42. Given an Employee Table with Salary Column, Find 2nd and 5th highest salary in a particular department.

SQL

Ans. Select salary from (select salary from employee where department = order by salary desc limit 5) emp order by salary limit 1 AND Select salary from (select salary from employee where department = order by salary desc limit 2) emp2 order by salary limit 1

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Q43. What is the use of sql dialect ?

Hibernate

Ans. Dialect means "the variant of a language".

Similarly in case of SQL Dialect we specify what dialect of SQL to be generated keeping in mind of underlying database.

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Q44. What is the ideal use case for DynamoDB ?

Amazon Web Services (AWS)

Ans. Fast reads
Much more reads than writes

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Q45. create an SQL query across multiple tables involving outer joins

Database

Ans. Select * from table1 t1Left outer join table2 t2 on t1.tid = t2.id

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Q46. Can we load Yaml files into AWS DynamoDB ?

Amazon Web Services (AWS)

Ans. No

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Q47. What is the minimum number of tables required to perform a SQL join?

Database

Ans. 1 , We can do self join

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Q48. Sort an Employee Object based on Name or Age

Database

Ans. Use Comparable or Comparator interface

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Q49. Write SQL query to join 2 tables ?

SQL

Ans. Select * from table1 join Select * from table2

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Q50. In majority of the cases, the following join will give maximum number of results ? Reference

Database

a. Inner Join

b. Outer Join

c. Left Join

d. Right Join

Ans.b. Outer Join

Q51. Which if the following is true for SQL Joins ? Reference

Database

a. Left Join and Right Join gives equal number of Results

b. Outer Join and Inner Join gives equal number of Results

c. Inner Join gives maximum number of results records

d. Inner Join gives minimum number of result records

Ans.d. Inner Join gives minimum number of result records

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