How to Succeed When Decorating a Tree

Today I will talk about how hanging something on a (Java) tree can unexpectedly fail.

Suppose we have a class Bauble, with equals() and hashCode() methods properly in place.

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OneWebSQL is not so young

Let's face facts. OneWebSQL is not as young as you may think. It was born when the first Internet bubble which was called "Web 1.0" collapsed. Now that we've had Web2.0 for some time, OneWebSQL is a fully grown product.

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SQL Course - Part 5. On Nothing

If you need a reminder on how to set up the environment for this course, see the Environment and Basic Select posts.

Sometimes you don't know what to enter as a column value; for example, you don't know the publication year or the number of pages of a certain book. SQL has a special value to handle just that: NULL. NULL means "no data".

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