Suppose I have a query:
SELECT ga_channelGrouping, ga_sourceMedium, SUM(ga_sessionDuration)/SUM(ga_sessions) as avg_sessionDuration
FROM database.table
group by ga_channelGrouping, ga_sourceMedium
.
How do I select last week and this week's data from BigQuery if I have a DATE column which looks like this 2018-06-19 11:00:00 UTC.
DATE_TRUNC is a useful function to get the beginning of the week and DATE_SUB gets you to last week
SELECT if(date(date) >= DATE_TRUNC(current_date(), WEEK(MONDAY)),"This Week","Last Week") weekPeriod,
ga_channelGrouping,
ga_sourceMedium,
SUM(ga_sessionDuration)/SUM(ga_sessions) as avg_sessionDuration
FROM database.table
WHERE date(date) >= DATE_SUB(DATE_TRUNC(current_date(), WEEK(MONDAY)), INTERVAL 1 WEEK)
group by weekPeriod, ga_channelGrouping, ga_sourceMedium
If your week starts on a Sunday, simply change WEEK(MONDAY) to WEEK(SUNDAY)