<p>What is the <code>@</code> symbol mean in <a href="/questions/tagged/oracle" class="post-tag" title="show questions tagged &#39;oracle&#39;" rel="tag">oracle</a>? </p>

<p>For example:</p>

<pre><code>select * from question_answer@abcd where id = '45'
</code></pre>

It refers to a non-local table, the bit behind the @ is the db descriptor.
```
```
select * from question_answer@abcd where id = '45'
```
```
Means select not from the local
```
question_answer
```
table, but from the table on the db designated as
```
abcd
```
. The keyword to google for is
```
dblink
```