• A check constraint requires a value in the database to comply with a specified condition,
16.01 How to create Primary
Key Constraint
In every table a row 1 record need to be identified by one unique column, That column value can be defined and Primary Key, Creating a table without primary key is not advisable since any record need to be identified by some value, The primary key of a relational table uniquely identifies each record in the table, It can either be a normal attribute that is guaranteed to be unique or it can be generated by the DBMS (such as a globally unique identifier, or GUID, Primary keys may consist of a single attribute or multiple attributes in combination, Generally, the column declared as primary key will get populated from system generated sequence number, The various constraints will be proposed in any database, wherein the primary key is one of the constraints,
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