Introduction
UNIQUE
NOT NULL
CHECK
DEFAULT
Instruction
Great! Now, you should know that the logical conditions after the CHECK constraint can be complex. Take a look at the example below:
price decimal(5,2) CHECK (price > 0.00 and price < 800.00)
As you can see, we can join more than one condition to make bigger logical statements.
Exercise
Fill the template we prepared for you so that the column hours has a constraint: greater than 0 and lower than 999.
Stuck? Here's a hint!
Type
CREATE TABLE video_game ( id IDENTITY PRIMARY KEY, name varchar(32) UNIQUE NOT NULL, genre varchar(32) NOT NULL, studio varchar(32), multiplayer boolean, hours int check (hours > 0 and hours < 999), price decimal(5, 2) );
