CREATE TABLE table_70151 ("Surface" CLOB, "Event" CLOB, "Time  (  h : m : s  ) " CLOB, "Date" CLOB, "Place" CLOB)

When has a surface of road and an event of half marathon?
SELECT "Date" FROM table_70151 WHERE "Surface" = 'road' AND "Event" = 'half marathon'
SELECT "Date" FROM "table_70151" WHERE "Event" = 'half marathon' AND "Surface" = 'road'