SQL select multiple rows into one row : <p>I have a table with related data across multiple rows that I need to query as one row IF the meta_key value is in <code>('A', 'B', 'C')</code>.</p>

<pre><code>meta_id | post_id | meta_key | meta_value
--------+---------+----------+-----------
   1    |  1234   |    A     |    Foo
   2    |  1234   |    B     |    Bar
   3    |  1234   |    C     |    Baz
   4    |  1234   |    D     |    junk
</code></pre>

<p>What I am looking to end up with is a query that gives me results</p>

<p><strong>Output</strong></p>

<pre><code> A  |  B  |  C
----+-----+----
Foo | Bar | Baz
</code></pre>
