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SQL, also called sequel, is a language used to pull, edit, manipulate, and update data from databases. SQL works with relational databases that have a tabular schema, and it creates, joins, and alters tables as a response to queries. Online businesses store their data online and use the structured query language to communicate with the databases. SQL’s use is prominent across industries such as sales, marketing, and in a wide range of tech-related jobs. 

Companies with an online presence use databases and hire professionals who can work with the data. If you are looking to hire SQL candidates for entry-level or experienced proficiencies, make sure to include the below-listed SQL Interview Questions in your recruitment process. A candidate’s response to these questions can reveal their knowledge of the SQL language.

SQL Interview Questions and Answers

1. What can be used to add a row in a database using SQL?

  1. ADD
  2. AUGMENT
  3. INSERT
  4. CREATE

Ans: C

2. What command will you use to remove rows from a table 'AGE'?

  1. REMOVE FROM AGE 
  2. DROP FROM AGE 
  3. DELETE FROM AGE WHERE 
  4. UPDATE FROM AGE 

Ans: C

3. What does the SQL WHERE clause do?

  1. Limits the column data that are returned
  2. Limits the row data that are returned
  3. Both a and b
  4. None of the above

Ans: B

4. What is the purpose of SQL?

  1. To define data structures
  2. To specify the syntax of DDL
  3. To specify the syntax of DML
  4. All of the above

Ans: D

5. The wildcard in a WHERE clause is used when___________

  1. A right match is required in a SELECT statement
  2. A right match is possible in a CREATE statement
  3. A right match is not possible in a SELECT statement
  4. None of the above

Ans: C

6. Define a view?

  1. A virtual table that can be accessed with SQL commands
  2. A base table that can be accessed with SQL commands
  3. Both a and b
  4. None of the above

Ans: a

7. What command will you use to eliminate a table from a database?

  1. ELIMINATE TABLE CUSTOMER;
  2. DROP TABLE CUSTOMER;
  3. DELETE TABLE CUSTOMER;
  4. APPRISE TABLE CUSTOMER;

Ans: b

8. What does an ON UPDATE CASCADE ensure?

  1. Standardization
  2. Data Integrity
  3. Both a and b
  4. None of the above

Ans: B

9. What does SQL data definition commands make up?

  1. DDL
  2. DML
  3. DQL
  4. DCL

Ans: A

10. Choose the valid SQL for an Index?

  1. CREATE INDEX ID;
  2. ALTER INDEX ID;
  3. ADD INDEX ID;
  4. DELETE INDEX ID;

Ans: A

11. Which SQL keyword(s) is used with wildcards?

  1. IN and NOT IN
  2. NOT IN only
  3. LIKE only
  4. IN only

Ans: C

12. Choose the correct order of keywords for SQL SELECT statements

  1. WHERE, SELECT, FROM
  2. SELECT, FROM, WHERE
  3. SELECT, WHERE, FROM
  4. FROM, WHERE, SELECT

Ans: b

13. What is a subquery in an SQL SELECT statement enclosed in?

  1. brackets []
  2. braces {}
  3. parenthesis () 
  4. none of the above

Ans: C

14. What is the result of a SQL SELECT statement?

  1. report
  2. form
  3. table
  4. file

Ans: c

15. Select the built-in functions provided by SQL

  1. SUM, MIN, MAX, MULT, AVG
  2. SUM, MULT, DIV, MIN, AVG
  3. SUM, MIN, MAX, NAME, AVG
  4. COUNT, SUM, AVG, MAX, MIN

Ans: D

Online Assessments for Assessing Programmers

An online test can be used to measure different types of technical skills. You can make use of an online test platform to administer multiple-choice SQL query interview questions in the pre-hiring stage. If the job role requires an assessment of coding abilities, then you can make use of the online coding tests to analyse simple to complex coding skills. You can assess different levels of coding proficiencies required for job roles

across industries using online assessments. You also have the option to measure specific programming skill sets by using project-based coding questions or customised domain-specific questions. The online tests are automated to ensure a quick turnaround of results.

Applications of MeritTrac Assessment Solutions

Assessing technical skills through traditional recruitment methods can be quite challenging. If you are a recruiter from a non-IT background, then MeritTrac’s assessment platforms can help you administer technical tests with ease. You can evaluate various levels of SQL proficiencies with MeritTrac’s online assessment platforms. These platforms come with an auto evaluation feature that provides quick test results and helps you select efficient candidates in less time. Its comprehensive reports let you evaluate the code’s simplicity, readability, and other parameters. 

MeritTrac’s online test platforms offer a plethora of features that simplify technical hiring. Recruiters can administer these online tests to candidates in any location. They can also remotely monitor the tests, assess the results, and make hiring decisions on the spot. 

When it comes to workforce development, MeritTrac’s SQL tests help to identify employees with skills gaps. The test results can be used to create training and development programs that can be beneficial for employees who want to update their skills as per the latest industry trends.

MeritTrac Platform for SQL Programming Assessment

MeritTrac’s CodeTrac is a domain assessment platform trusted by recruiters across industries for hiring technical talents. Over 3 lakh IT assessments have been administered using CodeTrac. You can make use of CodeTrac to cut down the time required to hire entry-level and experienced SQL professionals.  

The key features of this highly adaptive integrated assessment platform are:

  • Facilitates seamless administration of testing stages
  • Offers a comprehensive programming language library 
  • Delivers quick and reliable test results through auto evaluation 
  • Enables performance benchmarking with a real-time feedback mechanism 
  • Supports full-stack software development assessment

 

MeritTrac’s scientifically designed assessment solutions feature regularly updated SQL interview questions and customisable coding scenarios. Online tests administered through MeritTrac platforms can help to cut down on cost, time, and effort involved in your hiring process.

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