CREATE TABLE table_47258 ("Block" FLOAT, "Director" CLOB, "Writers" CLOB, "Producer" CLOB, "Code" CLOB)

What is the lowest block for director Graeme Harper?
SELECT MIN("Block") FROM table_47258 WHERE "Director" = 'graeme harper'
SELECT MIN("Block") FROM "table_47258" WHERE "Director" = 'graeme harper'