A tuple is a fixed fixed-length list containing elements that need not have the same type. It can be, and often is, used as a key-value pair. A row (sometimes called a record) is the set of fields within a table that are relevant to a specific entity.
The stem wall on a concrete foundation is essentially the supporting wall that joins the foundation of a building to the vertical walls of the structure that is constructed atop the foundation.
Anatomy. The footing is attached to the stem wall, which generally meets a vapor retarder at grade, then extends at least 18 inches above ground to be topped with a termite shield, sill plate, treated band joist and floor joists. The bottom of the footing below a stem wall is placed below the frost line.