One of the reasons I called renamed this blog grassroots-oracle was to occasionally illustrate some simple examples of functionality not everyone is aware of - or are maybe too scared to give it a go (or research).
Still today I occasionally work with people who aren't familiar with some features I almost take for granted.
Today's little observation was with ROLLUP - a function used in
I was looking at log frequency by month, and I also needed to consider grand total, so consider:
It's one of those features in the data warehousing guide that should possibly be in an area more accessible. While I don't necessarily use it for production code - it's syntax that I often find handy with ad hoc queries while interrogating the database.
You'll also want to check out single row functions such as GROUPING.
Go nuts.
Still today I occasionally work with people who aren't familiar with some features I almost take for granted.
Today's little observation was with ROLLUP - a function used in
group by queries to provide sub-totals.I was looking at log frequency by month, and I also needed to consider grand total, so consider:
 |
| Rollup folks! |
select count(*), trunc(view_date,'mm')
from activity_log
group by rollup(trunc(view_date,'mm'))
order by 2 desc nulls last
You'll also want to check out single row functions such as GROUPING.
Go nuts.