What Is Difference Between Unique Constraint And Primary Key Constrai

1.	What Is Difference Between Unique Constraint And Primary Key Constraint ?
Answer» A COLUMN DEFINED as UNIQUE can contain Nulls while a column defined as PRIMARY KEY can't contain Nulls. A column defined as UNIQUE can contain Nulls while a column defined as PRIMARY KEY can't contain Nulls.

What Is Difference Between Unique Constraint And Primary Key Constraint ?

Answer»

A COLUMN DEFINED as UNIQUE can contain Nulls while a column defined as PRIMARY KEY can't contain Nulls.

A column defined as UNIQUE can contain Nulls while a column defined as PRIMARY KEY can't contain Nulls.