SQL Constraints | Online Course | Vertabelo Academy

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You did great! Now you know how to make sure that a column in a database has a value.

Now you'll learn how to control the values in the column. We present you a CHECK constraint!

9/9 Congratulations

2. NOT NULL recap – defining a column as NOT NULL

3. NOT NULL recap – trying to add a NULL value

4. Adding NOT NULL to existing tables

5. Removing NOT NULL from existing tables

6. Adding and removing NOT NULL – exercise

9. Congratulations

Excellent! That was the last exercise in this part. Congratulations!

In the next part, we'll talk about a new constraint type: CHECK. See you there!

Click Next exercise to finish this part.

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