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Questions and Answers
What is the purpose of the PRIMARY KEY constraint in SQL?
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Which DML command is used to modify existing records in a table?
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Which SQL data type would you use to store precise monetary values?
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How does a FOREIGN KEY constraint function in SQL?
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Which of the following defines a variable-length character string in SQL?
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What does the NOT NULL constraint enforce on a database column?
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Which transaction command ensures that changes made are permanently saved to the database?
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What does the WHERE clause do in a SQL query?
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Which of the following SQL statements correctly filters employees in the 'HR' department?
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What is the purpose of using aliases in a SQL query?
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How can you retrieve specific columns from a SQL table instead of all columns?
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Which SQL statement demonstrates the correct use of greater than operator?
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Which SQL command would you use to group records for aggregation purposes?
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What is the result of this SQL statement: SELECT * FROM employees WHERE age > 30;?
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Which of the following correctly illustrates the basic syntax of a SELECT statement?
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How can you select only specified columns from a table instead of all columns?
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Which of the following clauses would you use to arrange results in descending order based on a specific column?
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What is a key characteristic of a primary key in a database table?
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How does a foreign key contribute to database integrity?
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What is the limitation of a unique constraint in SQL?
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Which function does a check constraint perform in a database?
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What aspect of SQL Data Integrity ensures that all values in a column adhere to defined formats or restrictions?
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What is the purpose of the SUM() function in SQL?
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Which clause should be used to filter groups after an aggregation has been performed?
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Which of the following statements correctly represents the order of execution in a SQL query?
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When would you use the COUNT() function in a SQL query?
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What is a key difference between the HAVING and WHERE clauses?
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What is the main purpose of using the GROUP BY clause in SQL?
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Which of the following is an example of conditional aggregation?
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In which situation would you use the HAVING clause rather than the WHERE clause?
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What is the correct order of execution for a SQL statement involving GROUP BY and HAVING?
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Which aggregate function would best be used to find the smallest sales figure in a dataset?
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What does the AVG() function do in SQL?
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Which clause is used to filter groups after aggregation has been performed?
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In the statement SELECT department, COUNT(*) FROM employees GROUP BY department HAVING COUNT(*) > 10;, what does the HAVING clause filter for?
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