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What are the primary data integrity constraints in SQL?

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Online Mathematics tutor with 4 years experience(Online Classes for 10th to 12th)

Primary key constraint is must for each tables so that SQL can create Clustered Index behind the scene to perform DML(Insert/Update/Delete) and select operations quickly. Without clustered index, nonclilustered index will not work and that's the reason we always create primary key constraint.
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Data Engineering| Snowflake Architect | | MSBI with 12 Years experience

Primary key constraint is must for each tables so that SQL can create Clustered Index behind the scene to perform DML(Insert/Update/Delete) and select operations quickly. Without clustered index, nonclilustered index will not work and that's the reason we always create primary key constraint.
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