title: Error #1241 - Operand should contain 1 column(s)
body: <p>I am trying this QUERY, and return this weird error. What does it mean?</p>
  
  <p>Here is my query:</p>
  
  <pre><code>SELECT * FROM newRowP a WHERE a.rowId IN 
  (SELECT * FROM newCellP b WHERE b.cellId IN 
  (SELECT * FROM newproviderP c WHERE c.pId IN ('3000344','245')))
  </code></pre>