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SET @@group_concat_max_len = 5000;
SET @sql = NULL;
SELECT
  @sql = GROUP_CONCAT(DISTINCT
    +(
      ' MAX(IF(cid = "', d.cid, '", `data`, NULL)) AS ', c.form_key
    )
  )
FROM 
webform_submitted_data AS d
INNER JOIN webform_component AS c ON c.cid = d.cid AND d.nid = c.nid;
SET @sql =
CONCAT(
  'SELECT *, ', @sql, '
	FROM webform_submitted_data
  GROUP BY sid ORDER BY nid, sid, cid'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;