CREATE TABLE table_23242958_1 (no_in_series VARCHAR, written_by VARCHAR)

What number episode in the series was written by David Zuckerman?
SELECT no_in_series FROM table_23242958_1 WHERE written_by = "David Zuckerman"
SELECT "no_in_series" FROM "table_23242958_1" WHERE "David Zuckerman" = "written_by"