MultimusenSQL and MySQL
Above you see the atomic building blocks of the ER-Diagram: Entity Attribute Relation Carninalities (Crow’s feet notation) one, zero-or-one, zero-or-many, one-or-many, many. From Requrements to Deployment ER-Diagram This ER-Diagram is inspired by some of the tables in his sample database Database Implementation Here are Ben Forta’s tables in PhpMyAdmin “design viewW. During implementation you […]
PhpMyAdmin is powerfull but the GUI is messy. Adminer is a lightweight alternative. You have to download the files and place them in your folder. # sudo apt-get isntall adminer # sudo ln -s /usr/share/adminer/ adminer The first line will install the files. They are saved in /usr/share/adminer. Therefore we need a symbolic link to […]
This post contiues the SQL tutorial on the Shire Bakery. Here we’ll So how do yo find the most popular cake in the Shire Bakery? Here’s an idea. — Show the best cookie — See: Ben Forta Chap. 16 SELECT COUNT( cakes.cake ) AS ‘popular’, cakes.cake, costumers.who FROM cakes, costumers, likes — sort out the […]
Here’s a short tutorial on how to solve some basic SQL cardinalities. First have a look at the ER-diagram for the database and the resulting tables in PhpMyAdmin. Many-to-Many Many to many cardinalities may be solved like this: SELECT cake, who FROM cakes, costumers, likes WHERE costumers.costumers_id = likes.costumers_id AND cakes.cakes_id = likes.cakes_id Note that […]
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