CREATE TABLE table_30193 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

Who wrote 'it's only rock and roll'?
SELECT "Written by" FROM table_30193 WHERE "Title" = 'It''s Only Rock and Roll'
SELECT "Written by" FROM "table_30193" WHERE "Title" = 'It\'s Only Rock and Roll'