There is plenty of lock-in with commercial databases, although the problem is improving. SQL/PSM originated with Oracle, and the ADA syntax is slowly creeping

There is plenty of lock-in with commercial databases, although the problem is improving. SQL/PSM originated with Oracle, and the ADA syntax is slowly creeping into many database products (but notably not Microsoft/Sybase). If you use PSM, then a number of database products are off the table. https://en.wikipedia.org/wiki/SQL/PSM https://en.wikipedia.org/wiki/SQL/PSM