On 12/29/2016 02:23 PM, Fabien COELHO wrote:

There is a singleton table :)

create table foo(x integer unique not null default 1 check(x = 1), y integer);
insert into foo(y) values(100);
analyze foo;

I know this one. It can be empty, which a singleton cannot be. For a singleton table, you should have one and only one row, you cannot insert or delete, so this is only part of the real thing.

Surely we can do a bit better than that, if that's what you really want. Create the table with an initial row and add a trigger preventing anything except update.

Andrew Dunstan                https://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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