How can i get a query to count a number of strings?

I want the query to count for me how many holidays there are to the USA in my table. But im not sure how to get it to retreive the result of a string or varchar2 datatype. This is what i have tried so far.
select count(COUNTRYVIS) <<this column contains all the countries visited
from "IT220_HOLIDAYDETAILS" <<this is the table where the column is
where COUNTRYVIS = "USA" << this is the result i want it to count
ORA-00904: "USA": invalid identifier <<this is the error message im getting, is there a way to count strings?
Thanks in advance!

This has nothing to do with APEX. Please post basic SQL questions on the +{forum:id=75}+ forum.
In any OTN forum, alll code should be posted wrapped in <tt>\...\</tt> tags as described in the FAQ:
select count(COUNTRYVIS) -- this column contains all the countries visited
from "IT220_HOLIDAYDETAILS" -- this is the table where the column is
where COUNTRYVIS = "USA" -- this is the result i want it to countYou appear to be struggling with the distinction between identifiers and text literals. Hint: One uses double quotes, the other single quotes.
Note that quoted identifiers are generally not a good idea.

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