CREATE TABLE table_44 ("Scheme" CLOB, "Tariff code" CLOB, "BTs retail price  ( regulated ) " CLOB, "Approx premium" CLOB, "Prefixes" CLOB)

How many tariff codes have a bts retail price of 2.553p/min?
SELECT COUNT("Tariff code") FROM table_44 WHERE "BTs retail price (regulated)" = '2.553p/min'
SELECT COUNT("Tariff code") FROM "table_44" WHERE "BTs retail price (regulated)" = '2.553p/min'