Keys in dbms(UNIT 2)

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This document defines and describes several key concepts in database management systems including primary keys, candidate keys, super keys, foreign keys, alternate keys, and composite keys. A primary key uniquely identifies each record in a table and can only include one column. Candidate keys can also uniquely identify records but a table can have multiple candidate keys whereas only one can be designated the primary key. Super keys may contain multiple attributes to uniquely identify records. Foreign keys link data between tables, and alternate and composite keys are secondary candidate keys that can include multiple columns to uniquely identify records.

Education

KEYS
 Primary Key
 Candidate Key
 Super Key
 Foreign Key
 Alternate Key
 Composite Key

PRIMARY KEY
 A primary key, also called a primary keyword, is a column in a relational database table that's distinctive for
each record.
 It's a unique identifier, such as a driver's license number, telephone number with area code or vehicle
identification number (VIN).
 A relational database must have only one primary key.

CANDIDATE KEY
 A candidate key is a set of one or more columns that can uniquely identify a row within a table, while a
primary key is a candidate key that is chosen to be the official unique identifier for a row within the table.
 A table can have multiple candidate keys, but can only have one primary key.

SUPER KEY
 Super key is a single key or a group of multiple keys that can uniquely identify tuples in a table.
 Super Key can contain multiple attributes that might not be able to identify tuples in a table independently,
but when grouped with certain keys, they can identify tuples uniquely.

FOREIGN KEY
 A foreign key (FK) is a column or combination of columns that is used to establish and enforce a link between
the data in two tables to control the data that can be stored in the foreign key table.

ALTERNATE KEY
 An alternate key is the secondary candidate key that contains all the property of a candidate key but is an
alternate option.

COMPOSITE KEY
 In database design, a composite key is a candidate key that consists of two or more attributes (table columns)
that together uniquely identify an entity occurrence (table row).

The document defines and describes different types of keys used in database management systems. It explains that a primary key uniquely identifies each row in a table and cannot contain null values or duplicate values. A candidate key can also uniquely identify rows but other attributes can also qualify. An alternate key is like a primary key but a table can only have one primary key while other candidate keys are alternate keys. A composite key contains two or more columns that together uniquely identify each row. A super key can identify rows but may contain extra attributes, allowing null values. A foreign key points to the primary key in another table to link the tables.

Types of keys in dbmsdarshhingu

This document defines and explains different types of keys used in relational database management systems. It describes super keys as any set of attributes that uniquely identify a record, with primary keys being a single attribute that uniquely identifies each record. Candidate keys are minimal super keys, and alternate keys are candidate keys other than the primary key. Foreign keys link two tables by referencing the primary key of one table from another table.

What are Database keys in Database Systempunjabcollege8685

What are Database Keys in Database Systempunjabcollege8685

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The document discusses different types of keys used in database tables. It defines keys as fields that retrieve and sort table rows based on requirements. The main types of keys discussed are candidate keys, primary keys, super keys, composite keys, secondary keys, and foreign keys. It provides examples of each key type and their properties, such as candidate keys uniquely identifying rows, primary keys being selected from candidate keys, and foreign keys linking tables by matching primary keys.

key.pptxlaptophp39

The document defines and describes different types of keys used in database management systems. It discusses primary keys, candidate keys, alternate keys, composite keys, super keys, and foreign keys. A primary key uniquely identifies each record in a table and cannot contain null values. Candidate keys and alternate keys can also uniquely identify records. Composite keys consist of multiple attributes that uniquely identify records. Super keys can uniquely identify records but may contain extra attributes and allow null values. Foreign keys link data between tables by pointing to the primary key of another table and can contain null values.

DBMS key topic Presentation slide 1.pptxsonudhakad173

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The document discusses different types of keys used in database management systems. It defines primary keys as columns that uniquely identify rows in a table and cannot contain null values. It also describes candidate keys, super keys, foreign keys, alternate keys, composite keys, and surrogate keys. The key types allow tables to be linked together and ensure uniqueness and integrity of data in the tables.

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The document discusses different types of keys used in database management systems (DBMS) to uniquely identify and relate data between tables. It defines keys such as primary keys, foreign keys, candidate keys, surrogate keys, composite keys and others. For example, it states that a primary key uniquely identifies each row in a table and cannot be duplicate, while a foreign key creates a relationship between two tables by referencing the primary key of another table.

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The document explains various types of keys in SQL, including primary, foreign, composite, candidate, alternate, and super keys, detailing their definitions, use cases, and syntactical representations. Primary keys uniquely identify records and can only exist once per table, while foreign keys establish relationships between tables. Composite keys combine multiple columns to ensure record uniqueness, and alternate and candidate keys can also uniquely identify records, with specific rules for their usage and null values.

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The document explains the concept of keys in SQL, which are essential for uniquely identifying rows in database tables. It covers various types of keys including primary keys, foreign keys, composite keys, alternate keys, candidate keys, and super keys, detailing their definitions, uses, and syntax for creation and modification. Additionally, it provides scenarios and examples for implementing these keys in table structures.

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This document discusses different types of keys used in databases. It defines keys as attributes that help uniquely identify rows in tables. It then explains various key types including super keys, candidate keys, primary keys, alternate keys, unique keys, composite keys, foreign keys, natural keys and surrogate keys. For each key type, it provides examples from sample tables and discusses their properties and how they differ from each other. The document concludes that databases generally only contain primary, foreign, unique and surrogate keys, while other key types are conceptual, and that each table needs a unique key to guarantee reliable data access.

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This document discusses different types of keys used in databases. It defines keys as attributes that uniquely identify rows in tables. It then explains various key types including primary keys, candidate keys, super keys, alternate keys, unique keys, composite keys, foreign keys, natural keys and surrogate keys. For each key type, it provides examples from sample tables and discusses their properties and how they differ from each other. The document concludes that databases generally only contain primary, foreign, unique and surrogate keys, while other key types are conceptual, and that each table requires a unique key to reliably access and identify data.

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The document discusses various types of keys in databases, including super keys, candidate keys, primary keys, alternate keys, unique keys, composite keys, foreign keys, natural keys, and surrogate keys. It explains their definitions, properties, and examples, emphasizing their role in uniquely identifying records in tables and establishing relationships between different tables. The conclusion highlights the necessity of keys for ensuring data integrity and reliability in database management.

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Keys in DBMS help uniquely identify rows in tables. There are several types of keys: super keys identify rows but may have extra attributes; primary keys uniquely identify rows and cannot be duplicate or null; foreign keys create relationships between tables by referencing the primary key of another table. Candidate, alternate, compound, composite, and surrogate keys also uniquely identify rows but have their own distinguishing properties. Primary keys cannot be modified if referenced by foreign keys.

Keys.pptxrevathi s

Keys play an important role in relational databases by uniquely identifying rows and establishing relationships between tables. There are several types of keys including primary keys, super keys, candidate keys, alternate keys, foreign keys, compound keys, and composite keys. A primary key uniquely identifies each row in a table and cannot be null, while other keys like alternate and foreign keys link data between tables or can uniquely identify rows without being designated as the primary key.

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The document explains various types of keys in database management systems (DBMS), including super, primary, candidate, alternate, foreign, compound, composite, and surrogate keys. Each type serves distinct roles, such as uniquely identifying records, establishing relationships between tables, and maintaining data integrity. Additionally, it outlines the characteristics and rules associated with primary and candidate keys, emphasizing their importance in database design.

A Presentation of Types of Keys in RDBMS.pptxharman6895ala

The document outlines different types of keys used in database management: primary key, candidate key, super key, alternate key, foreign key, and composite key. Each key serves a unique purpose in identifying records and establishing relationships between tables, with primary keys uniquely identifying each row and foreign keys acting as references across multiple tables. Composite keys consist of multiple columns that can also uniquely identify records when no primary key exists.

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RDBMS stands for Relational Database Management System. It stores data in tables with rows and columns and provides operators to manipulate the data. RDBMS uses SQL as its query language. The leading RDBMS products are Oracle, IBM DB2, and Microsoft SQL Server. Keys like primary keys and foreign keys are used to identify rows and relate tables through common columns. Data integrity rules constrain column values to ensure consistency.

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The document defines and provides examples of various types of keys used in database management systems, including super keys, primary keys, candidate keys, alternate keys, foreign keys, compound keys, composite keys, and surrogate keys. It explains that primary keys uniquely identify rows, foreign keys create relationships between tables, and surrogate keys are artificial keys used when no natural key exists.

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Database keys are used to establish relationships between tables in a relational database and uniquely identify records. There are several types of keys: super keys identify tuples within a relation using one or more attributes; candidate keys are minimal super keys; the primary key is the candidate key chosen to uniquely identify tuples; alternate keys are other candidate keys not used as the primary key; a composite key is a primary key formed from multiple attributes; and a foreign key in one table references the primary key in another table to link the tables.

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Keys are used to establish relationships between tables and uniquely identify records. The main types of keys are: - Primary key - uniquely identifies each record and is never null; every table must have a primary key. - Foreign key - references a primary key in another table to link the tables; ensures referential integrity. - Candidate key - minimum set of fields that uniquely identify records; one is selected as the primary key while others are alternate keys.

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The document discusses different types of keys in database management systems (DBMS). It defines keys as attributes that help uniquely identify rows in database tables. The main types of keys discussed are primary keys, foreign keys, candidate keys, alternate keys, composite keys, and super keys. Primary keys uniquely identify each row and cannot contain null values or duplicates. Foreign keys link rows between tables. Candidate keys could serve as primary keys but only one is chosen. Alternate and composite keys provide other unique identifiers. Super keys may contain non-key attributes. Keys help maintain data integrity and relationships between tables in a DBMS.

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Keys in dbms(UNIT 2)

1. KEYS IN DBMS BY:SURBHI SAROHA

2. KEYS  Primary Key  Candidate Key  Super Key  Foreign Key  Alternate Key  Composite Key

3. PRIMARY KEY  A primary key, also called a primary keyword, is a column in a relational database table that's distinctive for each record.  It's a unique identifier, such as a driver's license number, telephone number with area code or vehicle identification number (VIN).  A relational database must have only one primary key.

4. CANDIDATE KEY  A candidate key is a set of one or more columns that can uniquely identify a row within a table, while a primary key is a candidate key that is chosen to be the official unique identifier for a row within the table.  A table can have multiple candidate keys, but can only have one primary key.

5. SUPER KEY  Super key is a single key or a group of multiple keys that can uniquely identify tuples in a table.  Super Key can contain multiple attributes that might not be able to identify tuples in a table independently, but when grouped with certain keys, they can identify tuples uniquely.

6. FOREIGN KEY  A foreign key (FK) is a column or combination of columns that is used to establish and enforce a link between the data in two tables to control the data that can be stored in the foreign key table.

7. ALTERNATE KEY  An alternate key is the secondary candidate key that contains all the property of a candidate key but is an alternate option.

8. COMPOSITE KEY  In database design, a composite key is a candidate key that consists of two or more attributes (table columns) that together uniquely identify an entity occurrence (table row).

9. THANK YOU 

Keys in dbms(UNIT 2)

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