Did you know that you can use the SQL Server aggregate functions SUM, COUNT, MAX, MIN and AVG with an OVER Clause now?
Using an OVER clause you can produce individual record values along with aggregate values to different levels, without using a GROUP BY clause. You can also produce running totals, rolling averages, etc.
The examples in this article are based on the AdventureWorks2014 database.
Aggregate To Different Levels with OVER (PARTITION BY ….)
The following question was put to me last week:
“In the following table there are month on month totals (perhaps for sales). I would like to show the red, yellow and green trend arrows against each value to show the change against the previous month’s value. Using the same logic I need to show the same coloured arrows for the same data expressed as a percentage change.”
In other words, changing this chart...
System time changes can cause major problems to applications and business data. It is extrememly important that any system time changes are planned and explained.
The following command lines can be used to carry out a quick check to see how manu times the system time has been changed.
On a CentOS/RHEL version 6 or equivalent:
grep -c “Time has been changed” /var/log/messages
On a CentOS/RHEL version 7 or equivalent:
journalctl | grep -c "Time has been changed"