Quizzes de desarrollo web

The HAVING statement must be used along with the GROUP BY statement.
False
True

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

A primary key column can contain NULL values.
False
True

This query is correct: SELECT * FROM employee ON age = 25;
False
True

A CREATE TABLE statement is a data definition language (DDL).
False
True