Podcast
Questions and Answers
What is the purpose of the ROUND()
function in SQL?
What is the purpose of the ROUND()
function in SQL?
Which aggregate function returns the number of unique values in a column?
Which aggregate function returns the number of unique values in a column?
What is the purpose of the GROUP BY
clause in SQL?
What is the purpose of the GROUP BY
clause in SQL?
Which SQL clause is used to filter the results of a GROUP BY
statement based on an aggregate function?
Which SQL clause is used to filter the results of a GROUP BY
statement based on an aggregate function?
Signup and view all the answers
What is the purpose of a JOIN
in SQL?
What is the purpose of a JOIN
in SQL?
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?
Which type of join returns all rows from both tables, regardless of whether there is a match in the other table?
Signup and view all the answers
What is the purpose of the ON
clause in a JOIN
statement?
What is the purpose of the ON
clause in a JOIN
statement?
Signup and view all the answers
How do you reference a column from a specific table when working with multiple tables in a query?
How do you reference a column from a specific table when working with multiple tables in a query?
Signup and view all the answers
What is the difference between a primary key and a foreign key in a database?
What is the difference between a primary key and a foreign key in a database?
Signup and view all the answers
Which aggregate function calculates the sum of values in a column?
Which aggregate function calculates the sum of values in a column?
Signup and view all the answers