Re: boolean to int

Pavel Stehule wrote:
> create or replace function int2bool (integer) returns boolean as '
>   select case when $1=1 then ''t''::boolean else ''f''::boolean end;
> ' language sql;

I'd do it slightly differently, if only to cater to the principle of least surprise:

create or replace function int2bool (integer) returns boolean as '
   select case when $1=0 then false else true end;
' language sql

That way, 0 maps to false, any non-zero value becomes true.

> create or replace function bool2int (boolean) returns integer as '
>   select case when $1 then 0 else 1 end; ' language sql;

And that's back-to-front ;)

create or replace function bool2int (boolean) returns integer as '
   select case when $1 then 1 else 0 end;
' language sql


Thanks for the example of the use of casts.

Alex Satrapa