Which is the SQL constraint that allows inputting NULL in a specified column in a DBMS table but that does not allow inputting the already entered value?
Question
Solution 1
The SQL constraint that allows inputting NULL in a specified column in a DBMS table but does not allow inputting the already entered value is the UNIQUE constraint.
Here are the steps to use it:
- First, you need to define the table and its columns. For example, let's create a table named "Stude Knowee AI is a powerful AI-powered study tool designed to help you to solve study problem.
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