My previous company is actually in the process of switching from Oracle to MySQL. That said doing so is of nightmarish proportions because they have 10-15 year

My previous company is actually in the process of switching from Oracle to MySQL. That said doing so is of nightmarish proportions because they have 10-15 years of legacy behind them of building their own ORM, using a modern one and just raw Oracle-SQL (no ANSI joins there!) to either replace, rewrite or drop.