what is siena 2002 when the president is andrew jackson?
CREATE TABLE "scholar_survey_results" (
  "president" text,
  "schl_1948" text,
  "schl_1962" text,
  "m_b_1982" text,
  "ct_1982" text,
  "siena_1982" text,
  "siena_1990" text,
  "siena_1994" text,
  "r_mc_i_1996" text,
  "schl_1996" text,
  "c_span_1999" text,
  "wsj_2000" text,
  "siena_2002" text,
  "wsj_2005" text,
  "times_2008" text,
  "c_span_2009" text,
  "siena_2010" text,
  "uspc_2011" text,
  "aggr" text
);
SELECT "siena_2002" FROM "scholar_survey_results" WHERE "president"='andrew jackson';