Oracle data types variations : <p>I'm a new beginner to Oracle ,I'm so confused about the data types .</p>

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<p>I don't know the difference between :</p>

<ul>
<li><code>INT</code>,<code>INTEGER</code>,<code>NUMBER</code></li>
<li><code>CHAR</code>,<code>CHAR VARYING</code> ,<code>CHARACTER</code>,<code>CHARACTER VARYING</code></li>
</ul>
