Question

I just wanted to know how IN works in My SQL query?

Let’s say I have code as

select * from myTable WHERE id IN (5,9,2,4,6,3);

Will this be equivalent to

select * from myTable WHERE id = 5;
select * from myTable WHERE id = 9;
select * from myTable WHERE id = 2;
select * from myTable WHERE id = 4;
select * from myTable WHERE id = 6;
select * from myTable WHERE id = 3;

OR

order are random?

---

Edit 1

Here ORDER doesn’t mean ORDER BY. I meant first 5, then 9, then 2 and so on

OR

random order means first 4, then 3, then 2, so on….

Please let me know.

Answer 1

NO

In MySQL the IN clause is performed using a Binary Search. Reference

This means the search is optimized for performance and does not step through the list in order.