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);
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.
For example - MySQL @var is volatile - can be changed in query - that's
mean, you cannot use it as const for planner :(
Indeed, because of the ":=" within in a SELECT query, the variable is
updated at each round. Yuk.
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