CREATE TABLE "skin_depth_at_24_k_hz" (
  "material" text,
  "resistivity_10_6_ohm_inches" real,
  "relative_permeability" real,
  "skin_depth_inches" real,
  "surface_resistance_relative_to_copper" real
);

Question: What is the lowest relative permeability with a skin depth larger than 0.112 inches?
SQL: SELECT MIN("relative_permeability") FROM "skin_depth_at_24_k_hz" WHERE "skin_depth_inches">0.112;

Question: What is the average relative permeability with a resistivity smaller than 1.12 and a surface resistance relative to copper smaller than 1?
SQL: SELECT AVG("relative_permeability") FROM "skin_depth_at_24_k_hz" WHERE "resistivity_10_6_ohm_inches"<1.12 AND "surface_resistance_relative_to_copper"<1;

Question: What is the sum of skin depth with a resistivity of 1.12 and a relative permeability larger than 1?
SQL: SELECT SUM("skin_depth_inches") FROM "skin_depth_at_24_k_hz" WHERE "resistivity_10_6_ohm_inches"=1.12 AND "relative_permeability">1;