Practice - NOT NULL Constraint
Practice Questions
Test your understanding with targeted questions
What does the NOT NULL constraint do?
💡 Hint: Think about why it's important for certain data to always be present.
Which SQL statement would declare a NOT NULL column?
💡 Hint: Recall the structure used in CREATE TABLE statements.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the main role of the NOT NULL constraint?
💡 Hint: Think about what happens if a critical column lacks data.
True or False: The NOT NULL constraint can be applied to primary key columns.
💡 Hint: Recall how primary keys function in a database.
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Challenge Problems
Push your limits with advanced challenges
Define a SQL statement to create a Books table with columns Title (not null), AuthorID (not null), and PublishedYear. How would you ensure that Title and AuthorID always contain data?
💡 Hint: Remember that NOT NULL is added during table definition.
If a table named Employees includes columns for EmployeeName, EmployeeID, and Department, explain the consequences of not applying NOT NULL to EmployeeName. What could be the potential issues?
💡 Hint: Consider the practical implications of having NULL values in critical fields.
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Reference links
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