Web development quizzes

This query retrieves the first 3 rows: SELECT * FROM employee LIMIT 3;
False
True

A primary key column can contain NULL values.
False
True

Querying directly from a table takes more time than querying from a view.
False
True

This query is correct: SELECT column1 FROM table1 UNION SELECT column2 FROM table2;
False
True

You have to pay to use MySQL.
False
True