A Tiny Intro to Database Systems

Here is a short summary of DBMS : database management systems.

Part of the motivation behind those little chapters is described in another blog post here.

If you would like to read those in a nicely formatted PDF or if you have any questions / suggestions / requests, feel free to send me a tweet @dandancrisan.

 
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Now read this

Intro to Database Systems - Part 8 to 10 : Intermediate SQL

Using the next common keywords will return a column with only one row. They are called aggregate functions: 1) COUNT 2) AVG 3) SUM 4) MIN/MAX 1) COUNT : returns the number of rows matching a specific criteria. SELECT COUNT * FROM Skaters... Continue →