Re: 0/1 vs true/false

Jean-Christian Imbeault wrote:
> Just having a small argument with an application developer ...
>
> is using 0/1 for boolean types SQL compliant? I am trying to convince
> him that the proper SQL compliant (and postgresql compliant) syntax is
> true/false but he won't budge ...
>
> The app as currently written no longer works with postgres because they
> code uses 0/1 instead of the now enforced true/false for boolean types.
>
> Can someone point me to an SQL spec and section where this is clearly
> stated out?

Would this be what you are looking for:

ISO/IEC 9075-2:1999 (E) ©ISO/IEC
5.3 <literal>
(..)
<boolean literal> ::=
     TRUE
     | FALSE
     | UNKNOWN


Additionally about UNKNOWN:

ISO/IEC 9075-2:1999 (E) ©ISO/IEC
4.6 Boolean types
The data type boolean comprises the distinct truth values true
and false . Unless prohibited by a NOT NULL constraint, the
boolean data type also supports the unknown truth value as the
null value. This specification does not make a distinction
between the null value of the boolean data type and the unknown
truth value that is the result of an SQL <predicate>, <search
condition>, or <boolean value expression>; they may be used
interchangeably to mean exactly the same thing.

HTH,
Jochem