Joining a table is nice until that table is owned by a separate team. Becomes either gridlock or constant breakage, performance can get precarious, and testing

Joining a table is nice until that table is owned by a separate team. Becomes either gridlock or constant breakage, performance can get precarious, and testing involves populating a whole fake DB vs just mocking a few RPCs. I really like relational DBs. I'll make a system rely heavily on complex joins. But I'd rather call some other team's API than share DBs with them.