Question: Which province has a prefecture of Xiangxi with 0.81% of China's Tujia population?
SQL: SELECT "Province" FROM "2-152834-2" WHERE "Prefecture" = 'Xiangxi' AND "% of China's Tujia Population" = '0.81%';

Question: Which prefecture is in Hubei province and Enshi county?
SQL: SELECT "Prefecture" FROM "2-152834-2" WHERE "Province" = 'Hubei' AND "County" = 'Enshi';

Question: What is the sum of Tujia population with the Zhangjiajie prefecture in Sangzhi county?
SQL: SELECT SUM("Tujia Population") FROM "2-152834-2" WHERE "Prefecture" = 'Zhangjiajie' AND "County" = 'Sangzhi';