CREATE TABLE table_36942 ("Province" TEXT, "Prefecture" TEXT, "County" TEXT, "Tujia Population" FLOAT, "% of China's Tujia Population" TEXT)

What is the sum of Tujia population with the Zhangjiajie prefecture in Sangzhi county?
SELECT SUM("Tujia Population") FROM table_36942 WHERE "Prefecture" = 'zhangjiajie' AND "County" = 'sangzhi'
SELECT SUM("Tujia Population") FROM "table_36942" WHERE "County" = 'sangzhi' AND "Prefecture" = 'zhangjiajie'