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Intro to Databases, Video Lecture 3: Relational Databases, Querying Relational Databases | Megan Taylor

Megan Taylor

front-end dev, volunteacher, news & data junkie, bibliophile, Flyers fan, sci-fi geek and kitteh servant

Intro to Databases, Video Lecture 3: Relational Databases, Querying Relational Databases

steps in creating a using a relational database:
1. design schema, create schema using DDL
2. bulk load initial data
3. query and modify data

ad-hoc queries in high-level language
query language also used to modify data

queries return relations (compositional, closed)
when you get back the same type of object that you query = closure
compositionality = the ability to run a query over the result of a previous query

query languages
relational algebra – formal
greek symbols!!
SQL – actual (implemented) language

October 13, 2011 | Comments Off on Intro to Databases, Video Lecture 3: Relational Databases, Querying Relational Databases | Categories: Posts | Permalink

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