Extract year from current_date

Question

I am working with postgresql and I have a question

How do i extract the year from my current_date. I know how to extract day, month or year from a given date (for example: 2020-10-29). But I need to write a query, that gives certain informations between the beginning of the year and the end of the year. Is there a way to extract the year from my current_date and then to use this as a --select information between start extracted year from current_date and end extracted year from current_date.

Thanks in advance and stay healthy guys!

Answer 1

Usually, you don't want to compare the year only. Instead, you would typically truncate the current date to the beginning of the year.

In Postgres:

where mydate >= date_trunc('year', current_date)

If you want a check on the upper bound as well:

where mydate >= date_trunc('year', current_date)
  and mydate <  date_trunc('year', current_date) + interval '1 year'

If, for some other reason, you need to extract the current year, then use extract() :

extract(year from current_date)

Answer 2

In this example I have simulated the date you are sending/receiving as a c_d. Also, your data is in the table called "test" in this example...

WITH curr_date AS (
    SELECT to_date('2020-05-29', 'yyy-mm-dd') c_d
)
select *
from test
where EXTRACT(YEAR FROM my_date) = (select EXTRACT(YEAR FROM c_d) from curr_date);

Here is a demo:

DEMO