What is Unique Constraint in SQL?|| SQL Tutorial for beginners in Hindi Educate Cube

What is Unique Constraint in SQL?
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Hello everyone, welcome to Educate Cube. Today, we will talk about the Unique Constraint and what it is. The Unique Constraint ensures that the value in a specified column or set of columns is unique across all rows in the table. This means that, just like a Primary Key, all values in a particular column must be unique. This is what we call a Unique Constraint.
Now, let's look at the difference between a Primary Key and a Unique Constraint. A Primary Key does not allow any null values, whereas a Unique Constraint allows null values to be present. This is the main difference between a Unique and a Primary Constraint.
To define a Unique Constraint, when you create a table, you give the table a name, then specify the column name, its data type, and then you write the constraint as unique.
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