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  Tutorial: Make Unique Column in Database Table

In this section you will learn, how to define a unique key in a column of a database table.

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In this section you will learn, how to define a unique key in a column of a database table. While declaring unique key in a column we should check whether this column is eligible to store a unique values or not because if the column has been declared as unique then it can't store a duplicate values. If we ever try to insert the duplicate data in the unique column then it will show an error message to you that you are trying to insert the duplicate value.


 

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