OQL - Query language

OQL is a query language created in 1986.

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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...

OQL Wikipedia page
OQL first developed in http://www.odbms.org/odmg-standard
OQL on HOPL
Read more about OQL on the web: 1.
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Example 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