Examples Of Relational Database With Primary Key,candidate Key. Where And Why Is Primary As Well As Candidate Key Used?


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11.5pt : 'Times','serif'; mso-fareast-: 'Times New Roman'">Well dear!
11.5pt : 'Times','serif'; mso-fareast-: 'Times New Roman'">In a relational database a unique key or which is also known as a primary key is considered as a candidate key that is used for the identification of the row in each row and table. 12.5pt COLOR: Black; : 'Arial','sans-serif'; mso-ansi-language: EN">A unique key includes a single column or set of columns. There is only one primary keep but there can be many unique keys. However, the candidate key has to be unique within its domain; it does not hold null values and this key should never change.The example is very lengthy and can be accessed from given link: Example

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