Table Design
Everything on SkillVeris tagged Table Design — collected across the glossary, study notes, blog, and cheat sheets.
3 resources across 1 library
Interview Questions(3)
What Is a CHECK Constraint and When Would You Use One?
A CHECK constraint is a rule attached to a column or table that the database evaluates on every insert or update, rejecting any row whose values do not satisfy…
How Should You Decide Which Columns Get a NOT NULL Constraint?
A NOT NULL constraint should be applied to any column whose absence would make a row meaningless or would break downstream logic, such as identifiers, foreign…
How Does a DEFAULT Value Constraint Behave in SQL?
A DEFAULT constraint supplies a predetermined value for a column automatically whenever an INSERT statement omits that column entirely, but it never overrides…