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The syntax of Oracle datatypes appears in the diagrams that follow.

The text of this section is divided into the following sections: A datatype is either scalar or nonscalar.

Your goal is to study the smooth, parallel layers of rock to learn how the land built up over geologic time.

Now imagine that you come upon a formation like this: What do you think of it? How can you make any conclusions about rock layers that make such a crazy arrangement?

In historical geology, the primary methods of absolute dating involve using the radioactive decay of elements trapped in rocks or minerals, including isotope systems from very young (radiocarbon dating with Radiometric dating is based on the known and constant rate of decay of radioactive isotopes into their radiogenic daughter isotopes.

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The set of rocks (sedimentary, igneous or metamorphic) that formed during a geologic period is known as a system, so for example the 'Jurassic System' of rocks was formed during the 'Jurassic Period' (between 201 and 145 million years ago).

The following table includes all currently recognized periods.

The table omits the time before 2500 million years ago, which is not divided into periods.

The datatype of a value associates a fixed set of properties with the value.

These properties cause Oracle to treat values of one datatype differently from values of another. When you create a table or cluster, you must specify a datatype for each of its columns.