CREATE TABLE table_51869 ("Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB)

tell me the director of the production code ad1d02.
SELECT "Directed by" FROM table_51869 WHERE "Production code" = 'ad1d02'
SELECT "Directed by" FROM "table_51869" WHERE "Production code" = 'ad1d02'