Define key and types of key
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Key is a long and thin thing made of metal which helps in opening lock.there are many types of key twisted branched etc
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Key is a data item that exclusively identifies a record. In other words, key is a set of column(s) that is used to uniquely identify the record in a table.
Database supports the following types of keys.
Super Key
Minimal Super Key
Candidate Key
Primary Key
Unique Key
Alternate Key
Composite Key
Foreign Key
Natural Key
Surrogate Key
Database supports the following types of keys.
Super Key
Minimal Super Key
Candidate Key
Primary Key
Unique Key
Alternate Key
Composite Key
Foreign Key
Natural Key
Surrogate Key
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