All-capital writing is far harder to read for extended periods of time. If you're looking a a few short SQL statements embedded in other code or something, that

All-capital writing is far harder to read for extended periods of time. If you're looking a a few short SQL statements embedded in other code or something, that's not a big issue. If you're editing screen-filling report queries or editing a long data structure full of various SQL statements, it's a bigger deal.