text: #standardSQL
  # 17_17: Distribution of # CDNs per page
  SELECT
    client,
    APPROX_QUANTILES(cdns, 1000)[OFFSET(100)] AS p10,
    APPROX_QUANTILES(cdns, 1000)[OFFSET(250)] AS p25,
    APPROX_QUANTILES(cdns, 1000)[OFFSET(500)] AS p50,
    APPROX_QUANTILES(cdns, 1000)[OFFSET(750)] AS p75,
    APPROX_QUANTILES(cdns, 1000)[OFFSET(900)] AS p90
  FROM (
    SELECT
      client,
      COUNT(DISTINCT _cdn_provider) AS cdns
    FROM
      `httparchive.almanac.requests`
    GROUP BY
      client,
      page)
  GROUP BY
    client