Web development quizzes

LEFT JOIN returns all rows when there is at least one match in BOTH tables
False
True

You have to pay to use MySQL.
False
True

This query is correct: UPDATE table_name SET column1=value1;
False
True

This query is correct: SELECT * FROM employee WHERE age IN (20,21,22);
False
True

You can have several PRIMARY KEY constraints per table.
False
True