mysql - sql中两个语句的区别

Question

select * from a inner join b on a.id = b.aid和select * from a,b where a.id = b.aid效果一样吗？如果一样的话，用哪一个效果更好？为什么？

Answer 1

select * from a inner join b on a.id = b.id This is an inner join
select * from a, b where a.id=b.id This is an equijoin

The effect of inner join and equivalent join is the same, and the execution efficiency is the same