Difference between revisions of "Databases"

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==Terminology of relational model==
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A database is an organized collection of data. It is the collection of schemas, tables, queries, reports, views, and other objects. https://en.wikipedia.org/wiki/Database
 
A database is an organized collection of data. It is the collection of schemas, tables, queries, reports, views, and other objects. https://en.wikipedia.org/wiki/Database
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A very basic and nice explanation of the types of DBMS: https://www.youtube.com/watch?v=FR4QIeZaPeM&feature=emb_logo
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'''NoSQL databases''':<br />
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This is good to start understanding NoSQL databases and the difference with relational databases: https://www.youtube.com/watch?v=uD3p_rZPBUQ
  
  
* What is the primary key: '''title_id'''
 
* What is the foreign key: '''Pub_id'''
 
* What is the cardinality: '''13'''
 
: <span style="color:#FFFFFF; background:#000000"> select  count(title_id) as 'Cardinality of the «titles» table' from titles; </span>
 
* What is its degree: '''9'''
 
* What is the domain of contract: '''Smallint(6) NOT NULL'''
 
  
* What is the domain of ''country'' in the table ''Publishers'': '''varchar(15) NOT NULL'''
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'''Data Warehouse''':<br />
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This is a very good explanation of what a Data Warehouse is: https://www.youtube.com/watch?v=k4tK2ttdSDg
  
  
  
==[[MySQL]]==
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{{#lst:Mis páginas|databases}}
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Latest revision as of 19:09, 31 March 2023