Can you tell me the lowest Rank that has the Constituency of strathkelvin and bearsden?
CREATE TABLE "labour_targets" (
  "rank" real,
  "constituency" text,
  "winning_party_2003" text,
  "swing_to_gain" real,
  "labour_s_place_2003" text,
  "result" text
);
SELECT MIN("rank") FROM "labour_targets" WHERE "constituency"='strathkelvin and bearsden';