title: How to use mysql Union All on GORM?
body: <p>I'm working with complicated structure database, and after update we start using GORM so I need to transform this script using GORM.</p>
  <pre><code>query := `
    SELECT * FROM foo
    UNION ALL
    SELECT * FROM bar WHERE id=1`
  rows, err := db.Query(query)
  </code></pre>
  <p>What is the best way to do it?</p>