BigQuery using MAX() function - sql

Question

So I have a query in BQ that looks as such:
SELECT
SubscriptionId,
start_time,
STRFTIME_UTC_USEC((UTC_USEC_TO_MONTH(TIMESTAMP_TO_USEC(TIMESTAMP(start_time)))),'%B %Y') AS cohort_month,
UTC_USEC_TO_MONTH(start_time) AS usec_month,
STRFTIME_UTC_USEC((UTC_USEC_TO_WEEK(TIMESTAMP_TO_USEC(TIMESTAMP(start_time)), 0)),'%Y-%m-%d') AS cohort_week,
WEEK(start_time) AS usec_week,
DATE(start_time) AS cohort_day,
UTC_USEC_TO_DAY(start_time) AS usec_day,
amount,
current_period_start,
current_period_end,
cancel_date,
end_date,
cancel_at_period_end,
salesRepEmail,
CASE WHEN (salesRepEmail IS NOT NULL) THEN 'Telesales' ELSE 'Online' END AS sales_channel,
status,
type_id,
CASE WHEN (type_id IN ('150032',
'150033',
'150023')) THEN 'Annual' ELSE 'Monthly' END AS duration,
refunded
FROM
[data_snapshots_daily.subs_charges_refunds_]
WHERE
start_time >= '2016-04-01 00:00:00'
AND refunded = FALSE
What I'm looking to do though, is add on to the query so that it returns all the relevant data from the most recent month, week, and day.
So I imagine it involves something to do with MAX(usec_month) but I can't figure it out. Remember, I only want it to return relevant data when it's included in the most recent month (June)

Answer 1

i think of something like below
for current month
WHERE YEAR(CURRENT_DATE()) = YEAR(start_time)
AND MONTH(CURRENT_DATE()) = MONTH(start_time)
for current week
WHERE YEAR(CURRENT_DATE()) = YEAR(start_time)
AND WEEK(CURRENT_DATE()) = WEEK(start_time)
for current day
WHERE CURRENT_DATE() = DATE(start_time)
quick add
for last two weeks play with something like below (should be improved to handle first week of the year)
WHERE (YEAR(CURRENT_DATE()) = YEAR(start_time) AND WEEK(CURRENT_DATE()) = WEEK(start_time))
OR CASE WHEN WEEK(CURRENT_DATE()) = 1
THEN (YEAR(CURRENT_DATE()) - 1 = YEAR(start_time) AND 53 = WEEK(start_time))
ELSE (YEAR(CURRENT_DATE()) = YEAR(start_time) AND WEEK(CURRENT_DATE()) - 1 = WEEK(start_time))
END
Breakdown of above statement (per your request)
It looks for starttime that either belong to current or previous week. Current week is straightforward. In case of previous week it looks if current week is not the first week of the year - in this case condition is - same year but previous week. And in case if current week is first week of the year - it looks for last week of previous year.
cleaner version to handle last two weeks condition
DATE(start_time)>DATE(DATE_ADD(CURRENT_DATE(),-7*1-DAYOFWEEK(CURRENT_DATE()),'DAY'))
changing 1 in 7*1 to let's say 3 - will give you condition for last four weeks for example