NOT NULL Constraint
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What is NOT NULL Constraint?
The NOT NULL constraint in SQL ensures that a column does not accept null values. When a column is defined with this constraint, every row in the table must have a value for that specific column. Attempting to insert or update a row with a null value in a NOT NULL column will result in an error, maintaining data integrity by preventing missing or undefined entries.
Free resources to learn NOT NULL Constraint
- ArticleSQL IS NULL and IS NOT NULL
- VideoNOT NULL Constraint
More in stage 5: Aggregate Queries
NOT NULL Constraint: common questions
Can I learn NOT NULL Constraint in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain NOT NULL Constraint in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this NOT NULL Constraint tutorial for beginners?
It is lesson 40 of 112 in the free SQL roadmap, in stage 5, Aggregate Queries. If you are new to SQL, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.