The board shows records that point at each other, and the relational table that replaced them, where nothing points. This lesson is how a row gets a name it can be found by: a key.
Before you start. A table is a grid. A row is one record, like one student. A column is one fact about every record, like the class they sit in. Data Models and Query Languages gave you the relational model, tables of rows that share columns, with no pointers between them. This lesson is about how a row gets found when nothing points at it.
Lesson 4 of 17 in Data Systems
The rest of this lesson is part of a plan.
A plan opens every lesson, board, video, lab and paper on chalk. Yearly is $39/year, or $19.50 for your first year with LAUNCH50, ends 1 Nov, 18:30 UTC.
