📰00Primary key, grain of the table and group byReddit r/SQL·u/WiseWeird6306·about 1 month ago#toCPeTy1#primary#group#cols#grain#article#discussion+1 more🧰Tag tools✨Add tagCan someone explain me how to understand the difference between them? What I know- 1. Primary key is a column or set of columns that uniquely identifies each row. It may or may not have a business meaning 2.… Read more15s0Read later0Read More