generate days from date range

Question

I would like to run a query like

select ... as days where `date` is between \'2010-01-20\' and \'2010-01-24\'

And return data like:

Answer 1

Elegant solution using new recursive (Common Table Expressions) functionality in MariaDB >= 10.3 and MySQL >= 8.0.

WITH RECURSIVE t as (
    select '2019-01-01' as dt
  UNION
    SELECT DATE_ADD(t.dt, INTERVAL 1 DAY) FROM t WHERE DATE_ADD(t.dt, INTERVAL 1 DAY) <= '2019-04-30'
)
select * FROM t;

The above returns a table of dates between '2019-01-01' and '2019-04-30'. It is also decently fast. Returning 1000 years worth of dates (~365,000 days) takes about 400ms on my machine.