Re: Robust ways for checking allowed values in a column

How about adding null as an alteration.

Would this be robust?

Regards,

David

On Tue, 25 Jan 2022 at 14:25, David G. Johnston <david.g.johnston@gmail.com> wrote:

On Tue, Jan 25, 2022 at 6:56 AM Shaozhong SHI <shishaozhong@gmail.com> wrote:

 select form from mytable  where form ~ '^Canal$|^Drain$|^Foreshore$|^inlandRiver$|^Lake$|^lockOrFlightOfLocks$|^Marsh$|^Researvoir$|^Sea$|^tidalRiver$|^Transfer$'

You do not need to repeat the boundary metacharacters on each branch.  You can assert their presence just once and then use parentheses to group the alternations.

form ~ '^(?Canal|Drain|etc...)$'

David J.