Shankar Unni writes:
> I don't see implementation of "CHECK" CONSTRAINTS in the TODO list (e.g.
>
> CONSTRAINT val_ck check (val >= 0 and val <=5)
>
> Is this planned?
>
> I do see FOREIGN KEY constraints on the 4.0 list, so there is a way to do
> this kind of checking once this is implemented:
>
> * Create an associated "range-check" table with a primary key column, and
> add rows for the values you want to allow in your table column.
> * Put a foreign key constraint on your column to point at that table.
>
> This will at least ensure that you get a constraint violation if you attempt
> to insert something illegal.
>
> This works only for small ranges or other enumeration types (integer or
> string). E.g.
>
> create table check_phase_number (phase integer);
> insert into check_phase_number values (1),(2),(3),(4),(5);
>
> create table check_state_abbrev (state char(2));
> insert into check_state_abbrev values ('AK'),('AL'),('CA'), ...
> ('VT'),('WA');
>
> create table my_state_migration (
> phase integer constraint phase_fk foreign key references
> check_phase_number(phase),
> state char(2) constraint state_fk foreign key references
> check_state_abbrev(state),
> ...
> );
>
Hi!
We shall definitely consider putting it in 4.* branch.
Regards,
Sinisa
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