What is the lowest avg/g that has 2-9-0 for the att-cmp-int?
CREATE TABLE "passing" (
  "name" text,
  "gp_gs" text,
  "effic" real,
  "att_cmp_int" text,
  "avg_g" real
);
SELECT MIN("avg_g") FROM "passing" WHERE "att_cmp_int"='2-9-0';