OQL is an actively used query language. Object Query Language (OQL) is a query language standard for object-oriented databases modeled after SQL. OQL was developed by the Object Data Management Group (ODMG). Because of its overall complexity nobody has ever fully implemented the complete OQL. Read more on Wikipedia...
- the OQL wikipedia page
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Example code from the web:
select c.address from Persons p, p.children c where p.address.street = "Main Street" and count(p.children) >= 2 and c.address.city != p.address.city
Last updated June 22nd, 2020