mysql中字符串为查询字段时，里面的值为数字或者汉字对查询效率有影响吗

Question

selec * from student where age = '15'
selec * from student where age = '十五'
两条语句，假设age类型都为varchar，查询效率有区别吗

Answer 1

基本没区别，只是计算机底层对两种字符分解结果不一样，可以忽略