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.
A slab on grade with an independent stem wall is a concrete floor supported by the soil. independently of the rest of the building. The stem wall supports the building loads and in. turn is supported directly by the soil or a footing. A monolithic or thickened-edge slab is.