title: Object Query Language
text: # Object Query Language
  
  Object Query Language (OQL) is a query language standard for object-oriented databases modeled after SQL and developed by the Object Data Management Group (ODMG). Because of its overall complexity the complete OQL standard has not yet been fully implemented in any software. The OQL standard influenced the design of later query languages such as JDOQL and EJB QL, though none are considered to be any version of OQL.
  
  ## General rules
  
  The following rules apply to OQL statements:
  
  * All complete statements must be terminated by a semi-colon.
  * A list of entries in OQL is usually separated by commas but not terminated by a comma(,).
  * Strings of text are enclosed by matching quotation marks.
  
  ## Examples
  
  ### Simple query
  
  The following example illustrates how one might retrieve the CPU-speed of all PCs with more than 64MB of RAM from a fictional PC database:
  
  ### Query with grouping and aggregation
  
  The following example illustrates how one might retrieve the average amount of RAM on a PC, grouped by manufacturer:
  
  Note the use of the keyword partition, as opposed to aggregation in traditional SQL.
  
  