10 Questions
What is the purpose of the ROUND() function in SQL?
To round a numeric value to a specified number of decimal places
Which aggregate function returns the number of unique values in a column?
COUNT(DISTINCT column)
What is the purpose of the GROUP BY clause in SQL?
To return a single value for each value in the specified column(s)
Which SQL clause is used to filter the results of a GROUP BY statement based on an aggregate function?
HAVING
What is the purpose of a JOIN in SQL?
To combine data from two or more tables based on a related column
Which type of join returns all rows from both tables, regardless of whether there is a match in the other table?
Full outer join
What is the purpose of the ON clause in a JOIN statement?
To specify the condition for matching rows between the joined tables
How do you reference a column from a specific table when working with multiple tables in a query?
Use the table name followed by a period and the column name
What is the difference between a primary key and a foreign key in a database?
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
Which aggregate function calculates the sum of values in a column?
SUM(column)
Learn about key positions in information security management such as Chief Security Officer (CSO), Chief Information Officer (CIO), and Chief Technology Officer (CTO). Understand their responsibilities and hierarchy within organizations.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
