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SQL 1,[object Object],MDST 3559:  DataestheticsProf. Alvarado02/22/2011,[object Object]
Business,[object Object],If you are still having problems with VPN, call the Help Desk,[object Object],Anyone interested in an extra session on PHP?,[object Object], Thursday (2/24) from 1:30 to 3:30,[object Object]
Review,[object Object],PHP as a language,[object Object],Meanings,[object Object],Nouns and Verbs,[object Object],Grammatical words (prepositions, conjunctions),[object Object],Clauses and sentences,[object Object],Stories,[object Object],How to import a file and transform it using conditional logic,[object Object],See 02-17/rex.php,[object Object]
Overview,[object Object],This week we view another language devoted to working with data ,[object Object],Data are like “meanings”,[object Object],Data are what values are made of,[object Object],Works in tandem with PHP,[object Object],Lives at the “bottom” of the stack,[object Object],The foundation …,[object Object]
The Stack,[object Object],CSS,[object Object],HTML,[object Object],JavaScript,[object Object],INTERACTION,[object Object],HTML (DOM),[object Object],PHP,[object Object],Local files,[object Object],Remote files,[object Object],ALGORITHM,[object Object],SQL,[object Object],DATA,[object Object]
What does data look like?,[object Object],How is it organized?,[object Object]
Basic Data Structures,[object Object],Tables,[object Object],CSV,[object Object],Excel,[object Object],Arrays,[object Object],PHP,[object Object],JavaScript,[object Object],Trees,[object Object],XML and the “Document Object Model”(DOM),[object Object],Implied by CSS selectors, e.g.  .part p {},[object Object],Arrays of arrays, e.g. ,[object Object],$foo[0] = array();,[object Object],$foo[5][2] = “bar”;,[object Object]
What do these structures have in common?,[object Object]
Data Structures,[object Object],All have addressableelements,[object Object],Elements with unique names,[object Object],Row C, Column A,[object Object],DIV.section[1]/DIV.part[2]/P[5],[object Object],Alll have an implicit template of categories,[object Object],CSV has a header of column names,[object Object],XML has element types and classes,[object Object],Arrays have indexes,[object Object],All consist of repeated instances of the template,[object Object],E.g. rows,[object Object]
Categories, Instances, Values,[object Object]
Example,[object Object],What are the categories? Instances? Values?,[object Object]
Implicit Data Models,[object Object],All data structures have a data model,[object Object],May be implicit,[object Object],More or less coherent,[object Object],May not be “true”,[object Object],A data model is a schematic representation of how the categories in the template are related to each other,[object Object]
COUNTRY,[object Object],owns,[object Object],uses,[object Object],SOCIAL NETWORK,[object Object],US Debt,[object Object],Country X uses social network Y,[object Object],Country X owns US Debt Z (in billions of $),[object Object]
SQL,[object Object],SQL stands for “Structured Query Language”,[object Object],Pronounced S-Q-L or as “sequel”,[object Object],NOT invented by Microsoft,[object Object],Invented in the 1970s and commercialized in the 1980s,[object Object],Probably responsible for new business models,[object Object],Built on Codd’s relational model (1970),[object Object],Implements set theory,[object Object],Around the time of SGML,[object Object]
SQL,[object Object],A language used by relational databases,[object Object],Oracle, SQL Server, Access, etc.,[object Object]
MySQL,[object Object],A very fast, simplified, and easy to use relational database,[object Object],A client/server app,[object Object],Runs on the internet,[object Object],Not a desktop app like Access,[object Object],Created by Monty Widenius in the mid 1990s,[object Object],Open Source,[object Object],A Finn living in Sweden ,[object Object],Same time as PHP,[object Object],Powered the Web 2.0 revolution,[object Object]
phpMyAdmin,[object Object],A PHP interface to MySQL,[object Object],Relatively easy to use,[object Object],No need to know SQL,[object Object],Great to manage databases that your PHP programs will use,[object Object],Today you will get started using UVA’s free MySQL server ,[object Object]
Exercise,[object Object],Create a MySQL account,[object Object],Create a database called MDST2559,[object Object],Go to phpMyAdmin,[object Object],Import the file into a table called ‘demo’,[object Object]
Some SQL Commands,[object Object],From the SQL box, enter,[object Object],SELECT * FROM demo,[object Object],SELECT country, network FROM demo,[object Object],SELECT DISTINCT network FROM demo,[object Object],SELECT country, debt FROM demo WHERE network = ‘Facebook’,[object Object],SELECT country, debt FROM demo ORDER BY ‘debt’ DESC,[object Object]

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