how do you drop all data not equal to two values in a column

[Nabuu Shergill]

I know I can use the drop and keep functions to clean my data, but what happens if I have a column and I just want to keep the data in it that equals two values

ID	country
1	100
2	150
3	802
4	200

I want to drop all values that are not equal to either 100 or 200. So that my entire dataset has only countries represented by the numbers 200 and 100. I've tried using the code:

keep if country==100|200

But this deletes 0 observations. I tried using the following:

drop if race!=100 | 200

And this deleted ALL of the my observations.

I'm a bit confused here. Any help?

[Wouter Wakker]

keep if country == 100 | country == 200

or

keep if inlist(country, 100, 200)