This is the current syntax of the `SUBSTR[ING]` function in ANSI standard and in different RDBMS:
ANSI standard: SUBSTRING(s FROM start [FOR length])
PostgreSQL & MySQL: SUBSTR[ING](s, start [,length])
Oracle & SQLite: SUBSTR (s, start [,length])
SQL Server: SUBSTRING (s, start ,length )
To unify the syntax, I propose to add the `SUBSTRING` alias to the `SUBSTR` function. If Oracle does the same, we will be able to use the `SUBSTRING(s, start, length)` syntax in all above-mentioned RDBMS.
Changes proposed by me in other RDBMS: [https://github.com/iwis/SQL-notes/blob/master/Functions_proposed_changes.md](https://github.com/iwis/SQL-notes/blob/master/Functions_proposed_changes.md)