constraint

SQL UNIQUE Constraint

Leave a Comment / SQL Tutorials / By Harsh Singh

SQL UNIQUE Constraint are used while creating the table. The SQL UNIQUE Constraint make sure that all values in a column are ‘UNIQUE’ . It could be derived that ‘PRIMARY KEY’ and ‘ UNIQUE ‘constraint provides uniqueness to the table. Important: ‘Primary key’ and ‘ UNIQUE’ provides uniqueness to the table There could be only …

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SQL Check Constraint – Free SQL Tutorials

Leave a Comment / SQL Tutorials / By Harsh Singh

SQL Check Constraint This article will help you to pratice and devlop your concept for SQL CHECK Constraint.SQL ‘CHECK’ constraint are used in creating a table , and altering a table. It is used to limit the range of values that can be placed in columns. ‘CHECK’ constraint provides us with a condition , if …

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