See the whole table
Select some columns
Filtering rows
Logic
Text patterns
To be or NULL to be
A little bit of mathematics
Let's practice
Instruction
Great! Remember, NULL is a special value. You can't use the equal sign to check whether something is NULL. It simply won't work. The opposite of IS NOT NULL is IS NULL.
SELECT id FROM user WHERE middle_name IS NULL;
This query will return only those users who don't have a middle name, i.e. their middle_name is unknown.
Exercise
Select all columns for each car whose price is unknown (NULL).
Stuck? Here's a hint!
Type:
SELECT * FROM car WHERE price IS NULL;
