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Relational databases is set of database that related with each other
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We see that the table in the left (table = spritesheets) is the joint of table on the top right and bottom right
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It's important to discuss Relational Databases because it used in many field in Data Science
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This course won't be discussed about how to design, key and so on, that taught in Data Wrangling with MongoDB
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Aadhar program is the data initiative used in India
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With single number, it represent most of people's identitication that can be used in many organization in India.
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It interest many data scientist because it uses many data that represent some of the most huge population on earth.
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We can simply extract the man with age below 45 or else from big data. It's impossible to extract if we just use one flat files
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The database can scale vertically instead of horizontally effectively
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It's impossible if in one example the age is int type, while the other is string type
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Data is less redundant, because it represent how it is
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Not a good reason to choose relational database.
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How Aardhaar Data fit into relational databases that we discussed.
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Aardhaar consist of one database that range from various column, with each row is one people in India.
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We can substract many things based on the population, or district
