如何在 SQL 中选择 2 个月和一年？

Question

How to select data between 11-2017 AND 02-2018 ?

I did this SQL:

SELECT COUNT(tbl_data.avg)
FROM tbl_data
INNER JOIN tbl_one ON tbl_one.idx = tbl_data.idx
WHERE tbl_data.download_date
BETWEEN (MONTH(tbl_data.download_date) = (MONTH(tbl_one.dt) AND YEAR(tbl_data.download_date) = YEAR(tbl_one.dt))
AND (MONTH(tbl_data.download_date) = MONTH(NOW()) AND 
YEAR(tbl_data.download_date) = YEAR(NOW()))

but showed ZERO result. How to do that? Thanks before

Ps : the type of field download_date is DATE (YYYY-MM-DD)

Answer 1

So I've found how to make it happen. I just use this SQL command EXTRACT(YEAR_MONTH FROM mytable.date) . And my sampe query would be like this:

SELECT a.id, b.user_name
FROM a
INNER JOIN b
    ON a.id = b.id
WHERE EXTRACT(YEAR_MONTH FROM a.dl_date) >= EXTRACT(YEAR_MONTH FROM b.up_date)
    AND EXTRACT(YEAR_MONTH FROM a.dl_date) <= EXTRACT(YEAR_MONTH FROM NOW())