title: Aggregate function in MySQL - list (like LISTAGG in Oracle)
body: <p>I need function, that returns list of strings.</p>
  
  <p>I have data in table like this:</p>
  
  <pre><code>Id    MyString
  ------------------------
   1    First
   2    Second
   3    Third
   4    Fourth
  </code></pre>
  
  <p>I need function like this (something like this works in oracle):</p>
  
  <pre><code>select LISTAGG(MyString, ', ') as myList where id &lt; 4
  </code></pre>
  
  <p>That returns something like this:</p>
  
  <pre><code>myList
  ------------------------
  First, Second, Third
  </code></pre>
  
  <p>Any ideas?</p>