Re: Help with a SQL query

Dan Smith wrote:

> Can someone help me figure out a SQL query to do this?
>
> I have a table with 3 columns: date, count, host. It records the
> number of operations per day by a specific host. There are usually 3
> or 4 entries per day per host. I can do max(count)-min(count) to
> figure out how many operations per day were completed. What I need is
> a query that will output 3 columns: date, host1, host2; the rows will
> be the per-day counts. For example:
>
> Date Host1 Host2
> ---- ----- -----
> Feb-2 25 19
> Feb-3 20 29
> Feb-4 4 18

It is a pretty long sql command, but basically,
1. select a list of unique dates, then select a list of unique hosts,
and then select a count for the hits per host per date. I don't think it
is easy to list it out the way you want since there are an unknown
number of hosts. I would create an sql query to list it out
date host value
instead. Then, use your scripting language to organize the data the way
you want it. THe problem is you have an unknow number of hosts.
I would just use a perl script (or python, php), to select the
information, add it up, and the reformat it to print it out in the way
you want. I wouldn't bother doing this all in sql. I think some of it
has to be done in a programming language.

But I am not a total guru, so maybe there is a way.
Mark