how to know a primary key in a database
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The field or data column that is unique for each data entry and will not repeat shall be put as a Primary Key. Eg - Roll No, Employee ID .
Primary Key symbol is a Golden Key
Primary Key symbol is a Golden Key
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Explanation:
Primary Keys
Primary KeysYou can think of them as an address. If the rows in a table were mailboxes, then the primary key would be the listing of street addresses. When a primary key is composed of multiple columns, the data from each column is used to determine whether a row is unique.
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