MySQL的性能极限X1或限价0，X

Question

从以下哪个更好

select * , 98 as match_score from table_name order by match_score desc limit Y 

或

select *, 98 as match_score from table_name order by match_score desc limit 0,Y 

Answer 1

LIMIT Y是短期的LIMIT 0,Y所以我看不出在性能增益任何范围内。