SOQL query WHERE Date = 30_days_ago?

Question

How do I make a SOQL query like this?

SELECT id FROM Account WHERE LastActivityDate = 30_DAYS_AGO

This produces an error:

MALFORMED_QUERY: 
Account WHERE LastActivityDate = 30_DAYS_AGO
                      ^

Answer 1

SELECT id FROM Account WHERE LastActivityDate = LAST_N_DAYS:30

Answer 2

As you're doing this from apex, you can calculate the date in apex, then bind that into your query, e.g.

date d = system.today().addDays(-30);
Account [] acc=  [select id from account where createdDate = :d];

Answer 3

Select Id from Account Where LastActivityDate = N_DAYS_AGO:30