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  • To make Unique key as Primary

    @HIMANSHU
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    In SQL we have Unique Key and Primary Key


    Unique key is the key in which no value gets repeated including null once


    Primary key cannot be null and value must be unique


    So for making Unique key a primary key we will make it not null it will act as primary key


    Ex: create table student
       (
   stid int unique key not null,
   stname varchar(50)
       )
    SQL
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