CREATE TABLE "transmitters" (
  "transmitter_site" text,
  "frequency" text,
  "power" text,
  "rds_name" text,
  "pi_code" text,
  "area" text
);

Question: What is the PI code in the hindhead area?
SQL: SELECT "pi_code" FROM "transmitters" WHERE "area"='hindhead';

Question: What is the frequency with 900w power?
SQL: SELECT "frequency" FROM "transmitters" WHERE "power"='900w';