, which included a comparison of the definitions
&gt; of datatypes (including numbers) in the SQL92 standard, the SQL99
&gt; standard, and four different implementations of SQL, none of which
&gt; exactly conformed to the definitions in either of the two "standards".
&gt;
&gt; If physicists can't agree on a single definition of "space" and
&gt; "time" and mathematicians can't agree on a single definition
&gt; of "number", it is very difficult to imagine any concepts that
&gt; might be called "regular".
&gt;