The following example is based on an Adventure Works cube and shows you how to create a measure that ranks countries according to sales revenue.
It implements the following MDX functions:
The MDX WITH MEMBER statement creates a temporary measure for the rank value based on total internet slaes in the calendar year 2006, and the associated SELECT part uses the rank to order the countries.
I was recently asked by a delegate how they could calculate lost work hours due to sick days on a per month basis. This might sound fairly straight forward, but their database only stored the start date for the sickness period and the number of days for the sickness period. So, that means that if an employee was off sick for a period of 5 days starting October 28th, 3 of the days should be counted into October and 2 of the days should be counted in November. Not so simple after all!
Last week I was asked the following question:
“Is there any way that you can find out which hosts or IP addresses have been accessing your Apache Web Server the most?”
The answer to this question is “YES!”.
Apache maintains an access log file, its default location is in the Apache logs directory, but this can be defined in the Apache httpd.conf file. The “out of the box” location for the Apache distribution with CentOS/= and RHEL 6 and 7 is: /etc/httpd/logs/access_log. Here is an example of the the default log entries for this file:
In its out of the box configuration you may find that CentOS Linux has iptables configured to prevent inbound HTTP requests.
You can add access for inbound HTTP requests on port 80 with the following command:
iptables -I INPUT 4 -p tcp -m state --state NEW -m tcp -dport 80 -j ACCEPTLine 4 of the iptables -L output now shows that http is allowed inbound from anywhere:
SQL Server 2012 introduced a RESULT SET clause to the EXECUTE statement.
It can be used to specify alternate data types and column names for result sets returned by an EXECUTED statement or Stored Procedure.
The examples in this article are based on the AdvetureWorks2014 database.
The following example shows its use with an ad-hoc query example.
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"