> All that's left to do now is... the same joins, but inside the backend web server. Because we have to re-assemble these flat outputs into the structure of the page.
This is NOT the case with modern SQL, as it supports JSON. The typical Postgres use-case would be to produce denormalised views for the specific relationships and/or aggregates in JSON form. LATERAL, the correlated sub-query, is really convenient in avoiding double-counting. The rest of the article deals with object-mapping, which is really a poor man's VIEW. Time and time again, software engineers reinvent the data-access wheel out of ignorance to database capabilities.
This is NOT the case with modern SQL, as it supports JSON. The typical Postgres use-case would be to produce denormalised views for the specific relationships and/or aggregates in JSON form. LATERAL, the correlated sub-query, is really convenient in avoiding double-counting. The rest of the article deals with object-mapping, which is really a poor man's VIEW. Time and time again, software engineers reinvent the data-access wheel out of ignorance to database capabilities.