When learning SQL (or any other programming language) it is not sufficient to read books or listen to lectures. It's absolutly necessary that one does excercises - prescribed exercises as well as own made-up tests. In the case of SQL one needs access to a DBMS installation, where he can create tables, store, retrieve and delete data, and so on.
This page offers hints and links to some popular DBMS. In most cases one can download the system for test purposes or use a free community edition. Some of them offer an online version so that there is no need for any local installation. Instead such systems can be used in the cloud.
Often, but not always, a DBMS consists of more that the pure database engine. In order to be able to easily formulate SQL commands, we additionally need an interactive access to the database engine. This is provided by different client programms and IDEs. They offer such an interactive access - and they are part of the downloads. (In some cases there are several different clients from the same producer.) At the same time there are client programms and IDEs from other companies or organisations which offers only an interactive access but no DBMS. Such clients often support a lot of different DBMS.
The Oracle database engine is available in 4 editions: Enterprise Edition (EE), Standard Edition (SE), Standard Edition One (SE One) and Express Edition (XE). The last-mentioned is the community edition and is sufficient for the purpose of this course. http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html.
SQL-Developer is an IDE with an Eclipse-like look-and-feel and offers access to the database engine. http://www.oracle.com/technetwork/developer-tools/sql-developer/overview/
In the context of Oracles application builder APEX (APplication EXpress) there is a cloud solution consisting of a database engine plus APEX. https://apex.oracle.com/. Among a lot of other things it offers an SQL workshop where everybody can execute his own SQL commands for testing purpose. On the other hand APEX can be downloaded separately and installed into any of the above editions with the exception of the Express Edition.
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