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    <p>You might want to look at the <a href="http://perldoc.perl.org/perlintro.html" rel="nofollow noreferrer"><code>perlintro</code></a> and <a href="http://perldoc.perl.org/perlsyn.html" rel="nofollow noreferrer"><code>perlsyn</code></a> documents in order to really get started with understanding Perl (i.e., Read The Flipping Manual). :-)</p> <p>That said:</p> <ul> <li><code>$this</code> is a scalar, which can store a number (int or float), a string, or a reference (see below);</li> <li><code>@that</code> is an array, which can store an ordered list of scalars (see above). You can add a scalar to an array with the <code>push</code> or <code>unshift</code> functions (see <code>perlfunc</code>), and you can use a parentheses-bounded comma-separated list of scalar literals or variables to create an array literal (i.e., <code>my @array = ($a, $b, 6, "seven");</code>)</li> <li><code>%those</code> is a hash, which is an associative array. Hashes have key-value pairs of entries, such that you can access the value of a hash by supplying its key. Hash literals can also be specified much like lists, except that every odd entry is a key and every even one is a value. You can also use a <code>=&gt;</code> character instead of a comma to separate a key and a value. (i.e., <code>my %ordinals = ("one" =&gt; "first", "two" =&gt; "second");</code>)</li> </ul> <p>Normally, when you pass arrays or hashes to subroutine calls, the individual lists are flattened into one long list. This is sometimes desirable, sometimes not. In the latter case, you can use references to pass a reference to an entire list as a single scalar argument. The syntax and semantics of references are tricky, though, and fall beyond the scope of this answer. If you want to check it out, though, see <a href="http://perldoc.perl.org/perlref.html" rel="nofollow noreferrer"><code>perlref</code></a>.</p>
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    1. POWhat is the difference between `$this`, `@that`, and `%those` in Perl?
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    1. COSide note: In Perl (pre Perl 6), when you access an array or hash to retrieve a single element, at that point the `$` sigil is used for that access; this is because while you're digging into an array or hash, what you're actually GETTING is a scalar, and Larry Wall (the creator of Perl) believed it made more sense to use the scalar sigil to denote that the value you're getting can be used anywhere a normal scalar variable can be used.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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