You can tweak the map to be map { "avg($_) as $_\n" } to make it a little more legible, and then browse for errors. Did you try running the SQL directly in your db? What about a portion (e.g. w/just a few columns) of it?
If you want to exclude columns, simply grep them out of @cols, or to just ditch the first one, do a shift @cols;
Doing all the average calculations in one command may be a little taxing on my system.
No, doing all the average calculations in many commands is what will tax your system. If you do it in separate statements, you're making the database go through all 6000 rows 30 different times. But if you do it in one statement, it only needs one pass.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|