How to set a primary key in DBMS

1.	How to set a primary key in DBMS
Answer» Always welcome if u have any doubts in geography or computer sci u can ask. Ok,thanks bro towarrow is my practical exam so thanks☺ Only it contain a unique value for each record of table. Nope Can primary key valu be null? Primary key has to identify a unique value which can be present in a table, in a number form also. It means, primary key field allow number too.

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