CREATE TABLE table_17545 ("No. in series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" FLOAT)

Who directed the episode with production code 28?
SELECT "Directed by" FROM table_17545 WHERE "Production code" = '28'
SELECT "Directed by" FROM "table_17545" WHERE "Production code" = '28'