===== NOTE table =====

This table changed in version 5.2 of the OMOP CDM. The fields note_datetime, note_class_concept_id, note_title, encoding_concept_id, language_concept_id were added. 

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The NOTE table captures unstructured information that was recorded by a provider about a patient in free text notes on a given date.
^Field^Required^Type^Description^
|note_id|Yes|integer|A unique identifier for each note.|
|person_id|Yes|integer|A foreign key identifier to the Person about whom the Note was recorded. The demographic details of that Person are stored in the PERSON table.|
|note_date |Yes|date|The date the note was recorded.|
|note_datetime|No|datetime|The date and time the note was recorded.|
|note_type_concept_id|Yes|integer|A foreign key to the predefined Concept in the Standardized Vocabularies reflecting the type, origin or provenance of the Note.|
|note_class_concept_id|Yes|integer|A foreign key to the predefined Concept in the Standardized Vocabularies reflecting the HL7 LOINC Document Type Vocabulary classification of the note.|
|note_title|No|string(250)|The title of the Note as it appears in the source.|
|note_text|Yes|RBDMS dependent text|The content of the Note.|
|encoding_concept_id|Yes|integer|A foreign key to the predefined Concept in the Standardized Vocabularies reflecting the note character encoding type.|
|language_concept_id|Yes|integer|A foreign key to the predefined Concept in the Standardized Vocabularies reflecting the language of the note.|
|provider_id|No|integer|A foreign key to the Provider in the PROVIDER table who took the Note.|
|visit_occurrence_id|No|integer|Foreign key to the Visit in the VISIT_OCCURRENCE table when the Note was taken.|
==== Conventions ====
  * The NOTE table contains free text (in ASCII, or preferably in UTF8 format) taken by a healthcare Provider.
  * The Visit during which the note was written is recorded through a reference to the VISIT_OCCURRENCE table. This information is not always available.
  * The Provider making the note is recorded through a reference to the PROVIDER table. This information is not always available.
  * The type of note_text is CLOB or string(MAX) depending on RDBMS