From 1593 onwards, what is the difference between the number of comedy works and history works?
From 1593 onwards refers to Date > 1593; comedy works and history works refers to GenreType = 'comedy' and GenreType = 'History'
SELECT SUM(IIF(GenreType = 'Comedy', 1, 0)) - SUM(IIF(GenreType = 'History', 1, 0)) FROM works WHERE Date > 1593
database name:db_id shakespeare
chapters table chapters Cols: id dtype integer, Act dtype integer, Scene dtype integer, Description dtype text, work id dtype integer, 
characters table characters Cols: id dtype integer, char name dtype text, abbreviation dtype text, Description dtype text, 
paragraphs table paragraphs Cols: id dtype integer, paragraph number dtype integer, Plain Text dtype text, character id dtype integer, chapter id dtype integer, 
works table works Cols: id dtype integer, Title dtype text, Long Title dtype text, character id dtype integer, genre type dtype text, 
