On 22 May 2013, at 7:58pm, David de Regt <dav...@mylollc.com> wrote:

>  if I have a 300 column table

I'm going to sound my customary note of caution here.  Do you really have a 300 
column table or is it several thinner tables which have the same primary key ?  
Or do you really have a property list which should be one thinner table with a 
two-column primary key ?

Generally in database design you should be able to hold a table schema in your 
head.  When you find yourself numbering columns it's usually a sign you're 
doing something wrong.

Not true in every case, of course, and you may have one of the incredibly rare 
cases which really is best represented with a 300 column table.  In which case, 
please excuse me.

Simon.
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