@@ -312,6 +312,12 @@ <h2>Relational Databases</h2>
312312included with Python, creates a single file for all data per database. More
313313complicated databases such as Oracle, PostgreSQL, and MySQL are more tightly
314314coupled with the operating system after installation.</ p >
315+ < p > < a class ="reference external " href ="http://www.postgresql.org/ "> PostgreSQL</ a > and
316+ < a class ="reference external " href ="http://www.mysql.com/ "> MySQL</ a > are two of the most common open source
317+ databases.</ p >
318+ < p > < a class ="reference external " href ="http://www.sqlite.org/ "> SQLite</ a > is a database that is stored in a single
319+ file on disk. SQLite is built into Python but is only built for access
320+ by a single connection at a time.</ p >
315321</ div >
316322< div class ="section " id ="graph-databases ">
317323< h2 > Graph Databases</ h2 >
@@ -323,17 +329,13 @@ <h2>Graph Databases</h2>
323329business entity.</ p >
324330< p > A < em > property</ em > represents information about nodes. For example, an entity
325331representing a person could have a property of "female" or "male".</ p >
332+ < p > < a class ="reference external " href ="http://www.neo4j.org/ "> Neo4j</ a > is one of the most widely used graph
333+ databases and runs on the Java Virtual Machine stack.</ p >
326334</ div >
327335< div class ="section " id ="database-resources ">
328336< h2 > Database resources</ h2 >
329337< p > < a class ="reference external " href ="http://db-engines.com/en/ranking "> DB-Engines</ a > ranks the most popular
330338database management systems.</ p >
331- < p > < a class ="reference external " href ="http://www.postgresql.org/ "> PostgreSQL</ a > and
332- < a class ="reference external " href ="http://www.mysql.com/ "> MySQL</ a > are two of the most common open source
333- databases.</ p >
334- < p > < a class ="reference external " href ="http://www.sqlite.org/ "> SQLite</ a > is a database that is stored in a single
335- file on disk. SQLite is built into Python but is only built for access
336- by a single connection at a time.</ p >
337339</ div >
338340
339341 </ section >
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