Re: Alternate input for user defined data type

Aram Fingal wrote:
> I want to create a user defined data type but have flexible input just like, for example, the boolean
> data type where TRUE can be entered as any of (TRUE, true, T, t, YES, yes, Y, y, 1...) and it will be
> interpreted as the same thing.
> 
> So suppose I have days of the week:
> 
> CREATE TYPE  days_of_week AS ENUM ('Su','M','Tu','W','Th','F','Sa');
> 
> Except that I want 'MON', 'Mon', 'mon' and 'monday' all to be interpreted as 'M' in the data type.
> What is the best way to do this.? Is that what input_function is for in the CREATE TYPE command?  Do I
> need to create a trigger?

Yes, the type input function converts the string representation to the internal
representation, so that's where you'd implement that in a user defined data type.

Yours,
Laurenz Albe