Multiple choice technology programming languages

Which of the following is not valid constraint in SQL SERVER

  1. Default

  2. Check

  3. Distinct

  4. Unique

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

SQL Server constraints include Default, Check, Unique, Primary Key, and Foreign Key. DISTINCT is not a constraint - it's a query clause used to eliminate duplicate rows from SELECT results, not a rule enforcing data integrity.