Each ActiveRecord adapter does its best to create a common denominator for
CHAPTER 1 ?– INTRODUCING ACTIVE RECORD 16
each of these issues, so that nearly all Active Record methods, techniques, and data types are
available for each type of database. But as you can imagine, this is a difficult goal to achieve.
Databases, like any software application, continue to grow more and more complex and add
new features all the time.
With all this in mind, I recommend that you become as familiar as you can with the specific
database application you intend to use. I also highly recommend that you learn at least
the basics of ANSI SQL. These two chores will help you tremendously throughout your career
in debugging and developing even the most advanced Active Record programs. The following
list is a rundown of the most common databases available today and some good starting points
for learning more about each:
DbB2: DB2 has been around for a very long time, and some even consider it to be the first
database product to use SQL. DB2 is a commercial product provided by IBM and comes
in a variety of forms for a variety of platforms.
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