CREATE TABLE table_24066938_1 (pop_density_people_km_2 VARCHAR2, member_state VARCHAR2)

How many measurements of the Czech Republic's population density are recorded in this table?
SELECT COUNT(pop_density_people_km_2) FROM table_24066938_1 WHERE member_state = "Czech Republic"
SELECT COUNT("pop_density_people_km_2") FROM "table_24066938_1" WHERE "Czech Republic" = "member_state"