CREATE TABLE table_17008 ("Abbreviation" TEXT, "Voivodeship" TEXT, "Capital" TEXT, "Area km\\u00b2  ( 1998 ) " TEXT, "Population  ( 1980 ) " TEXT, "No. of cities" FLOAT, "No. of communes" FLOAT)

How many different voivodenship have 747 900 citizes?
SELECT COUNT("Voivodeship") FROM table_17008 WHERE "Population (1980)" = '747 900'
SELECT COUNT("Voivodeship") FROM "table_17008" WHERE "Population (1980)" = '747 900'