CREATE TABLE "current_line_of_headphones" (
  "headphone_model" text,
  "headphone_class" text,
  "driver_matched_d_b" text,
  "construction" text,
  "earpads" text,
  "termination" text,
  "us_msrp" text
);

Question: Which headphone models correspond to the US MSRP of $150?
SQL: SELECT "headphone_model" FROM "current_line_of_headphones" WHERE "us_msrp"='$150';

Question: Which terminations correspond to a US MSRP of $49?
SQL: SELECT "termination" FROM "current_line_of_headphones" WHERE "us_msrp"='$49';

Question: How many headphone classes have a US MSRP of $150?
SQL: SELECT COUNT("headphone_class") FROM "current_line_of_headphones" WHERE "us_msrp"='$150';

Question: How many values for earpads correspond to the headphone class Prestige and a US MSRP of $79?
SQL: SELECT COUNT("earpads") FROM "current_line_of_headphones" WHERE "headphone_class"='Prestige' AND "us_msrp"='$79';

Question: Which headphone models have a driver-matched DB of 0.1 and a US MSRP of $49?
SQL: SELECT "headphone_model" FROM "current_line_of_headphones" WHERE "driver_matched_d_b"='0.1' AND "us_msrp"='$49';

Question: Which terminations correspond with headphone model SR80I?
SQL: SELECT "termination" FROM "current_line_of_headphones" WHERE "headphone_model"='SR80i';