| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com> |
| Cc: | Jean-Christian Imbeault <jc(at)mega-bucks(dot)co(dot)jp>, Peter Eisentraut <peter_e(at)gmx(dot)net>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: 0/1 vs true/false |
| Date: | 2003-07-23 16:32:49 |
| Message-ID: | 13797.1058977969@sss.pgh.pa.us |
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| Lists: | pgsql-general |
"scott.marlowe" <scott(dot)marlowe(at)ihs(dot)com> writes:
> On Wed, 23 Jul 2003, Tom Lane wrote:
>> Well, there is no boolean type per se in SQL92. But there is in SQL99.
> Was it pulled from SQL92 before it went standard? My copy of the
> pre-release lists a boolean type, just like the 99 standard does.
Where? SQL92 says nothing about a declarable boolean datatype that
I can see. They're a bit schizophrenic in that they do define a lot
of operators that are described as returning boolean ... but you cannot
create a column of type boolean, nor is there a boolean-literal construct.
AFAICS, boolean values can only exist "in flight" between operators and
a WHERE or HAVING clause in SQL92.
regards, tom lane
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