Top SQL MCQ Questions to Boost Your Knowledge and Skills

Practicing SQL MCQ Questions is a great way to strengthen your understanding of SQL concepts, whether you're preparing for exams, interviews, or technical assessments. These questions cover topics like queries, joins, indexing, and more, helping you test and refine your knowledge. By solving SQL MCQ Questions, you can identify areas for improvement and gain the confidence to tackle real-world database challenges.

In the SQL Server tutorial, we will learn the top 150 most-asked SQL Interview Questions and clear your basic conceptsto enhance your skills!

Top 150 SQL MCQ Questions and Answers

Q1: What does SQL stand for?

Q2: Which of the following is NOT a SQL command?

Q3: Which SQL clause is used to filter the results of a query?

Read More: SQL WHERE Clause Explained: Filter Data with Precision

Q4: How do you select all columns from a table named "employees"?

Q5: Which function is used to find the maximum value in SQL?

Q6: What is the purpose of the PRIMARY KEY?

Read More: Differences between Primary Key and Foreign Key

Q7: Which SQL keyword is used to sort the result-set?

Q8: What is the correct syntax to insert a new record into a table?

Q9: Which operator checks for a NULL value?

Q10: How do you update a column value in SQL?

Q11: What does the COUNT() function return?

Q12: Which clause is used with aggregate functions to group rows?

Q13: What is a FOREIGN KEY?

Q14: How do you remove duplicates from a query result?

Q15: What does the SQL JOIN clause do?

Read More: Different Types of SQL Joins

Q16: Which JOIN returns all records from both tables, matching where possible?

Read More: Full Outer Join in SQL: A Comprehensive Guide

Q17: What does the HAVING clause do in SQL?

Q18: Which SQL keyword prevents duplicate rows in a result?

Q19: What is the default sorting order in SQL?

Q20: Which SQL command is used to create a new table?

Read More: What are the 5 Basic SQL Commands? (DDL, DML, DCL, TCL, DQL)

Q21: How do you fetch the first 10 rows from a table?

Q22: Which function returns the current date in SQL?

Q23: What does the LIKE operator do?

Q24: How do you rename a table?

Q25: Which function calculates the total sum of a column?

Q26: Which SQL clause is used to filter group rows?

Q27: How do you add a new column to an existing table?

Q28: Which command is used to remove a row in a table?

Q29: What does the DISTINCT keyword do in SQL?

Q30: Which SQL function is used to return the current time?

Read More: Different Types of SQL Server Functions

Q31: What is the result of a LEFT JOIN?

Read More: Understanding LEFT JOIN in SQL: A Simple Guide

Q32: Which of the following is true about an INNER JOIN?

Read More: Inner Join in SQL: How It Works

Q33: Which command is used to change an existing column's datatype in SQL?

Q34: Which operator is used to compare a value to a specified range of values?

Q35: What does the "IS NOT NULL" condition do?

Q36: How do you create an index on a table in SQL?

Q37: Which SQL statement is used to retrieve unique records from a table?

Q38: How do you specify the order of rows in SQL?

Q39: What is the result of an OUTER JOIN?

Read More: Understanding Outer Join in SQL

Q40: What is a subquery in SQL?

Q41: Which clause is used to remove duplicates after grouping?

Q42: Which of the following keywords is used for pattern matching?

Q46: What is an alias in SQL?

Q47: Which SQL function returns the length of a string?

Q48: How do you insert multiple rows into a table in SQL?

Q49: What is the default value of a column if not specified?

Q50: How do you delete all rows from a table without deleting the table itself?

Q51: How do you return the current system date and time in SQL?

Q52: Which SQL statement is used to add a constraint to a column?

Q53: Which SQL clause is used to combine rows from two or more tables?

Q54: What does the SQL IN operator do?

Q55: What is the default sorting order in an ORDER BY clause?

Q56: Which SQL clause is used to filter the results of a query based on the grouped data?

Q57: Which SQL clause is used to group rows in a SELECT statement?

Q58: What is the purpose of the SQL ALTER command?

Q59: What is the correct SQL statement to get all columns from a table named "products" where the price is greater than 100?

Q60: Which command is used to change the value of an existing row in SQL?

Q61: How do you remove a column from a table in SQL?

Q62: What is the correct syntax for using the SQL UNION operator?

Q63: Which SQL constraint ensures that a column contains only unique values?

Q64: What SQL clause is used to restrict the number of rows returned by a query?

Q65: How do you delete all rows from a table without removing the table structure?

Q66: Which of the following SQL statements is used to create a new table?

Q67: What SQL keyword is used to prevent duplicate rows from appearing in a result?

Q68: How do you retrieve the highest value from a column?

Q69: Which of the following keywords is used to change the value of an existing column?

Q70: Which of the following SQL statements is used to combine the result sets of two queries?

Q71: What SQL statement is used to delete data from a table?

Q72: How do you find the number of rows in a table?

Q73: What is the correct syntax to update a record in a table?

Q74: Which SQL clause is used to sort the result set in ascending or descending order?

Q75: What keyword is used to create a new database in SQL?

Q76: Which of the following is not a valid SQL data type?

Q77: How can you combine two tables in SQL based on a related column?

Q78: Which of the following is used to define a primary key in SQL?

Q79: What does SQL SELECT DISTINCT do?

Q80: Which function is used to calculate the sum of a column?

Q81: What is the purpose of the SQL HAVING clause?

Read More: SQL HAVING Clause Explained: Filter Your Data Like a Pro

Q82: What is the correct syntax for a CASE expression in SQL?

Q83: How can you retrieve all columns from the "employees" table in SQL?

Q84: How can you create an index on a table column?

Q85: How do you remove a table from a database?

Q86: What does SQL LIKE operator do?

Q87: What does the COUNT() function do?

Q88: Which SQL function is used to return the current date in a query?

Q89: Which of the following SQL clauses is used to combine two SELECT queries?

Q90: What is the use of SQL GROUP BY clause?

Q91: Which keyword is used to sort the result set in descending order?

Q92: How do you create a new user in SQL?

Q93: What does the SQL INNER JOIN clause do?

Q94: How can you ensure that a column contains only unique values in SQL?

Q95: What is the purpose of the SQL EXISTS operator?

Q96: What does the SQL NOT operator do?

Q97: What is a foreign key in SQL?

Q98: What does the SQL LIMIT clause do?

Q99: How do you rename a table in SQL?

Q100: How do you create a backup of a database in SQL?

Q101: What is the purpose of the SQL RANK() function?

Q102: What does the COALESCE() function do in SQL?

Q103: How does the SQL PARTITION BY clause work?

Q104: What is the main purpose of the SQL EXISTS operator?

Q105: How does the SQL CROSS JOIN work?

Q106: What is the purpose of the SQL CTE (Common Table Expression)?

Q107: What is the difference between UNION and UNION ALL?

Q108: What does the SQL CASE statement do?

Q109: What does the SQL NVL() function do?

Q110: How does the SQL DELETE statement work?

Q111: What is a clustered index in SQL?

Q112: What is the purpose of the SQL HAVING clause?

Q113: What is the difference between CHAR and VARCHAR?

Q114: What does the SQL DISTINCT keyword do?

Q115: What is the purpose of the SQL ROW_NUMBER() function?

Q116: How does the SQL DELETE and TRUNCATE commands differ?

Q117: What does the SQL MERGE statement do?

Q118: What is the purpose of the SQL PIVOT operator?

Q119: What does the SQL LEAD() function do?

Q120: What is a non-clustered index?

Q121: What is the function of the SQL GROUPING SETS clause?

Q122: What does the SQL CHECK constraint do?

Q123: How does the SQL DENSE_RANK() function differ from RANK()?

Q124: What does the SQL STRING_AGG() function do?

Q125: How does SQL indexing improve query performance?

Q126: What does the SQL STUFF() function do?

Q127: What is the purpose of the SQL FETCH clause?

Q128: What is the function of the SQL COLLATE clause?

Q129: What does the SQL DECODE() function do?

Q130: How does the SQL LAG() function work?

Q131: What is the purpose of the SQL FIRST_VALUE() function?

Q132: What does the SQL TRANSLATE() function do?

Q133: What is the difference between a PRIMARY KEY and a UNIQUE constraint?

Q134: What does the SQL RECURSIVE CTE do?

Q135: What is the main purpose of the SQL XML data type?

Q136: What is the function of the SQL JSON_VALUE() function?

Q137: What is the purpose of the SQL GREATEST() function?

Q138: What does the SQL WIDTH_BUCKET() function do?

Q139: What is a SQL WINDOW function?

Q140: What does the SQL NULLIF() function do?

Q141: What does the SQL PERCENT_RANK() function return?

Q142: What is the function of the SQL NTILE() function?

Q143: How does the SQL BITWISE AND (&) operator work?

Q144: What is the purpose of the SQL SOUNDEX() function?

Q145: What does the SQL ASCII() function return?

Q146: What does the SQL COALESCE() function do?

Q147: What is the purpose of the SQL CROSS APPLY operator?

Q148: How does the SQL PIVOT operator work?

Q149: What does the SQL CHECK constraint do?

Q150: What is the function of the SQL TRUNCATE TABLE command?

Conclusion

In conclusion, SQL MCQ questions are a great way to test your knowledge and understanding of SQL concepts. Whether you're preparing for an interview, an exam, or simply trying to enhance your SQL skills, practicing with SQL MCQ questions can help you identify areas for improvement. By regularly challenging yourself with these SQL MCQ questions, you will develop a deeper grasp of SQL syntax, functions, and queries, ultimately making you more proficient in database management and development.

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