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Docs: Data model -> Data models, note that NOT_NULL() is equal to SQL's COALESCE()
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‎Documentation/Books/AQL/Functions/Miscellaneous.mdpp

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`NOT_NULL(alternative, ...) → value`
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Return the first alternative that is not *null*, and *null* if all alternatives
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are *null* themselves.
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Return the first element that is not *null*, and *null* if all alternatives
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are *null* themselves. It is also known as `COALESCE()` in SQL.
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- **alternative** (any, *repeatable*): input of arbitrary type
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- returns **value** (any):
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- returns **value** (any): first non-null parameter, or *null* if all arguments
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are *null*
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!SUBSECTION FIRST_LIST()
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‎Documentation/Books/Manual/DataModeling/README.mdpp

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!CHAPTER Data model & modeling
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!CHAPTER Data models & modeling
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This chapter introduces ArangoDB's core concepts and covers
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‎Documentation/Books/Manual/SUMMARY.md

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* [Data models](Scalability/DataModels.md)
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* [Limitations](Scalability/Limitations.md)
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#
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* [Data model & modeling](DataModeling/README.md)
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* [Data models & modeling](DataModeling/README.md)
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# * [Collections](FirstSteps/CollectionsAndDocuments.md) #TODO
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* [Concepts](DataModeling/Concepts.md)
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* [Databases](DataModeling/Databases/README.md)

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