What exactly is happening when we make a field a primary key

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Manoj Bhatt · Answer

Primary Key:and  Primary key is a key that is selected as the primary key. Only one key within an entity is selected to be the primary key. This is the key that is allowed to migrate to other entities to define the relationships that exist among the entities. When the data model is instantiated into a physical database, it is the key that the system uses the most when accessing the table, or joining the tables together when selecting data.[WIKI]and and When we creating a primary key in a table such as below:SQLandgt; CREATE TABLE STUDENTS ( and ID INT and  and  and  and  and  and  and  and  and  and  and  and  and  NOT NULL, and NAME VARCHAR (20) NOT NULL, and AGE INT and  and NOT NULL, and ADDRESS CHAR (25), and PRIMARY KEY (ID) and ); and Here ID is a primary key. It willand internallyand and create a clustered index in a database.A clustered index will be created for that specific field.A clustered index sorts and stores the data rows in the table based on the index key values. Therefore only one clustered index canand be created on each table because the data rows themselves can only be sorted in one order.and A clustered index sorts and stores the data rows in the table based on the index key values. Therefore only one clustered index can be created on each table because the data rows and  and  and  and themselves can only be sorted in one order.and To create a different clustered index on the same table, change the Create as Clustered property setting on the existing clustered index before creating the second index.

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What exactly is happening when we make a field a primary key

Anupam Mishra

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