DBMS: Types of keys
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The document defines and provides examples of different types of keys used in database systems, including super keys, candidate keys, primary keys, alternate keys, composite keys, foreign keys, and unique keys. A super key can identify a tuple but contains extra attributes, while a candidate key is a minimal super key. The primary key is chosen by the administrator and must be unique. Alternate keys are other candidate keys, and composite keys comprise multiple attributes. Foreign keys link tables using primary keys, and unique keys are like primary keys but allow null values.
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Keys presentationmubeenkiran Keys are attributes or sets of attributes that uniquely identify tuples in a relational database table. There are several types of keys, including primary keys, super keys, candidate keys, alternate keys, composite keys, and foreign keys. Primary keys uniquely identify each tuple, super keys can identify tuples but may contain redundant attributes, candidate keys are super keys without redundancy, alternate keys are other attributes that can uniquely identify tuples besides the primary key, composite keys use multiple attributes, and foreign keys link tables by referencing a primary key in another table.
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Types of keys dbms
Types of keys dbmsSurkhab Shelly The document discusses different types of keys used in database management systems. It defines primary key as a minimal set of attributes that uniquely identify each row in a table. It also discusses candidate keys, alternate keys, super keys, composite keys, and foreign keys. Candidate keys are attributes that qualify for uniqueness. Alternate keys are other candidate keys besides the primary key. Super keys are attributes that include the primary key attributes. Composite keys are formed using multiple attributes when no single attribute uniquely identifies rows. Foreign keys link tables and enforce referential integrity.
DBMS-Keys , Attributes and Constraints.pptx
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DBMS: Types of keys
- 1. Ms. B.K.Ugale(bharati_ugale@rediffmail.com) 1 Types of Keys in Database System
- 2. Types of Keys Super Key Candidate Key Primary Key Alternate Key Composite Key Foreign Key Unique Key Ms. B.K.Ugale(bharati_ugale@rediffmail.com) 2
- 3. Super Key An attribute or set of attributes that are required to identifies a tuple in a relation. A Super Key may contain additional attributes that are not require for unique identification. Unique Key-Student_ID Super Key: {Student_ ID, Student_Name} {Studenr_ID, Student_Address} Ms. B.K.Ugale(bharati_ugale@rediffmail.com) 3
- 4. Candidate Key Candidate Keys are minimal set of Super Key Ms. B.K.Ugale(bharati_ugale@rediffmail.com) 4
- 5. Primary Key Primary Key is a candidate key chosen by database administrator for unique identification. No Two rows can have the primary key same values. Every row must have primary key value The primary key value can not be null Value in primary key can not be modified. Primary Key: PAN No. Ms. B.K.Ugale(bharati_ugale@rediffmail.com) 5
- 6. Alternate Key • Candidate keys other than primary key are called as a alternate key. • PK: PAN No. • Alternate Key: Voter Id No, Passport No Ms. B.K.Ugale(bharati_ugale@rediffmail.com) 6
- 7. Composite Key • Composite key is the one having combination of more than one attribute to uniquely determine the records/tuples in a table. • The only condition that is necessary before choosing composite key is, the attributes which are responsible for forming the composite key must not be a key individually. Ms. B.K.Ugale(bharati_ugale@rediffmail.com) 7
- 8. Foreign Key • A foreign key is nothing but an attribute that is commonly linked between two relation using that same attribute and that attribute must be primary key from one relation. • Both the relations/tables must contain the same attribute. • It can be referred as referential integrity Ms. B.K.Ugale(bharati_ugale@rediffmail.com) 8
- 9. Unique Key Unique key is same as primary key with the difference being the existence of Null value. Unique Key: MemberID Ms. B.K.Ugale(bharati_ugale@rediffmail.com) 9