Roles in Information Security Management
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Questions and Answers

What is the purpose of the ROUND() function in SQL?

  • To calculate the average of a column
  • To perform an inner join between two tables
  • To round a numeric value to a specified number of decimal places (correct)
  • To count the number of distinct values in a column
  • Which aggregate function returns the number of unique values in a column?

  • `COUNT(column)`
  • `SUM(column)`
  • `COUNT(DISTINCT column)` (correct)
  • `AVG(column)`
  • What is the purpose of the GROUP BY clause in SQL?

  • To calculate the average of a column
  • To perform an inner join between two tables
  • To return a single value for each value in the specified column(s) (correct)
  • To round a numeric value to a specified number of decimal places
  • Which SQL clause is used to filter the results of a GROUP BY statement based on an aggregate function?

    <p><code>HAVING</code></p> Signup and view all the answers

    What is the purpose of a JOIN in SQL?

    <p>To combine data from two or more tables based on a related column</p> Signup and view all the answers

    Which type of join returns all rows from both tables, regardless of whether there is a match in the other table?

    <p>Full outer join</p> Signup and view all the answers

    What is the purpose of the ON clause in a JOIN statement?

    <p>To specify the condition for matching rows between the joined tables</p> Signup and view all the answers

    How do you reference a column from a specific table when working with multiple tables in a query?

    <p>Use the table name followed by a period and the column name</p> Signup and view all the answers

    What is the difference between a primary key and a foreign key in a database?

    <p>A primary key is a column that uniquely identifies each row in a table, while a foreign key is a column that refers to a primary key in another table</p> Signup and view all the answers

    Which aggregate function calculates the sum of values in a column?

    <p><code>SUM(column)</code></p> Signup and view all the answers

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