How is SOQL IN different from NOT IN operator?

Question

In SOQL, will there be any advantage if I use the “IN” operator instead of “NOT IN”? If there are any performance benefits, what are they? Or is SOQL not in the same as SOQL IN?

I have a use case in which I have to filter the records based on a certain column, for instance, Region, which has many different values. NOT IN is preferred because, for filtration, only a bit of those values will be used.

For example, let us consider that there are 10 different values in Region: 1. NJ 2. NY 3. …

10. CL. The NOT IN will only have, say, NJ and NY.

https://salesforce.stackexchange.com/questions/290567/soql-in-vs-not-in-operator

Chris Evans · Accepted Answer

I think that instead of using NOT IN, you should use a selective query like IN. https://developer.salesforce.com/blogs/engineering/2013/07/maximizing-the-performance-of-force-com-soql-reports-and-list-views.html In your where clause, when you have IN, the records writing NOT IN get restricted by the query then. In the above case, unless you are trying to get the records that are based on regions that do not have NJ and NY, it will not do much.

How is SOQL IN different from NOT IN operator?

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