CREATE TABLE table_15173 ("Stage" CLOB, "Date" CLOB, "Course" CLOB, "Distance" CLOB, "Winner" CLOB, "Race Leader" CLOB)

What's the distance of the course of stage 4?
SELECT "Distance" FROM table_15173 WHERE "Stage" = '4'
SELECT "Distance" FROM "table_15173" WHERE "Stage" = '4'