MYSQL OR vs IN performance

Question

I am wondering if there is any difference in regards to performance between the following

SELECT ... FROM ... WHERE someFIELD IN(1,2,3,4)

SELECT ... FROM ..         


        

Answer 1

As explained by others, IN is better chosen than OR with respect to query performance.

Queries with OR condition might take more longer execution time in the below cases.

1. to execute if MySQL optimizer choses any other index to be efficient(during false positive cases).
2. If the number of records is more ( As clearly stated by Jacob )