Download MySQL and mSQL by Tim King PDF
By Tim King
MySQL and mSQL are well known and strong database items that aid key subsets of SQL on either Linux and UNIX platforms. either items are unfastened for non-profit use and value a small quantity for advertisement use. Even a small association or site has makes use of for a database. maybe you retain music of your whole consumers and locate that your details is outgrowing the crude, flat-file structure you begun with. otherwise you are looking to ask your internet site&39;s viewers for his or her pursuits and personal tastes and publish a clean online page that tallies the consequences. not like advertisement databases, MySQL and mSQL are cheap and simple to exploit. when you recognize easy C, Java, Perl, or Python, you could speedy write a software to have interaction along with your database. moreover, you could embed queries and updates correct in an HTML dossier in order that an internet web page turns into its personal interface to the database. This e-book is all you must utilize MySQL or mSQL. It takes you thru the complete technique from set up and configuration to programming interfaces and simple management. comprises reference chapters and plentiful educational fabric. issues contain: * Introductions to uncomplicated database layout and SQL * development, install, and configuration * simple programming APIs for C, C++, Java (JDBC), Perl, and Python * CGI programming with databases in C and Perl * internet interfaces: personal home page, W3-mSQL, Lite, and mSQLPerl"
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To complete the Song entity, we need to ask if there is more about a Song that we would like to capture. We identified earlier song length as something we might want to capture. Figure 2–3 shows the new data model. Figure 2–3. A data model with CD and Song entities Now that the Song Name and Song Length are attributes in a Song entity, we have a data model with two entities in 1NF. None of their attributes contain multiple values. Unfortunately, we have not shown any way of relating a CD to a Song.
The Physical Data Model for the CD Database Table Column Datatype Notes CD CdId INT primary key CDTitle TEXT(50) RecordLabelId INT foreign key ArtistId INT primary key ArtistName TEXT(50) SongId INT SongName TEXT(50) CdId INT foreign key ArtistId INT foreign key RecordLabelId INT primary key RecordLabelName TEXT(50) Artist Song RecordLabel primary key We do not have any 1-to-1 relationships in this data model. If we did have such a relationship, it should be mapped by picking one of the tables and giving it a foreign key column that matches the primary key from the other table.
Since all artists may not be bands, we will rename the attribute Artist Name. Figure 2–7 shows the new state of the model. Figure 2–7. The data model with the new Artist entity Of course, the relationships for the new Artist table are missing. We know that each Artist has one or many CDs. Each CD could have one or many Artists. We model this in Figure 2–8. We originally had the Band Name attribute in the CD entity. It thus seemed natural to make Artist directly related to CD. But is this really correct?