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Re:Apache Age: A Graph Extension for PostgreSQL by d110af5ccf on Saturday March 06, 2021 @07:58PM (#26372080)
It means that everything a relational database is capable of (from CS theory) can be done with a single column of values per table. Note that each such table also has a "column" of primary keys; in other words, it's a simple K -> V mapping.

Also note that just because you can do something doesn't mean that it will be efficient, or that it will be enjoyable to work with.

Re:Apache Age: A Graph Extension for PostgreSQL by dragonwriter on Sunday March 07, 2021 @10:28PM (#26382052)
> It means that everything a relational database is capable of (from CS theory) can be done with a single column of values per table. Note that each such table also has a "column" of primary keys

So, in other words, it's a two column table (“primary key” aren't some kind of virtual column, either in concrete databases or in relational theory.)

Calling a database with two columns one of which is the primary key a one-column table is...just wrong.