SQL Constraints

SQL Constraints

I want to discuss about SQL Constraints.
  1. Column level constraints : limits only column data
  2. Table level constraints : limits whole table data

Common types of constraints include the following:

  • NOT NULL Constraint: Ensures that a column cannot have NULL value.
  • DEFAULT Constraint: Provides a default value for a column when none is specified.
  • UNIQUE Constraint: Ensures that all values in a column are different.
  • CHECK Constraint: Makes sure that all values in a column satisfy certain criteria.
  • Primary Key Constraint: Used to uniquely identify a row in the table.
  • Foreign Key Constraint: Used to ensure referential integrity of the data.

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