/*********************************************************************************
# Copyright 2019 Observational Health Data Sciences and Informatics
#
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
********************************************************************************/

/************************

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snowflake script to create OMOP common data model version 6.0

last revised: 05-Aug-2019

Authors:  Kathryn Watson


*************************/


/************************

Standardized vocabulary

************************/


CREATE TABLE concept (
  concept_id			  INTEGER		NOT NULL ,
  concept_name			  VARCHAR	    NOT NULL ,
  domain_id				  VARCHAR		NOT NULL ,
  vocabulary_id			  VARCHAR		NOT NULL ,
  concept_class_id		  VARCHAR		NOT NULL ,
  standard_concept		  VARCHAR		NULL ,
  concept_code			  VARCHAR		NOT NULL ,
  valid_start_date		  DATE			NOT NULL ,
  valid_end_date		  DATE			NOT NULL ,
  invalid_reason		  VARCHAR		NULL
)
;


CREATE TABLE vocabulary (
  vocabulary_id			VARCHAR		NOT NULL,
  vocabulary_name		VARCHAR		NOT NULL,
  vocabulary_reference	VARCHAR		NOT NULL,
  vocabulary_version	VARCHAR		NULL,
  vocabulary_concept_id	INTEGER		NOT NULL
)
;


CREATE TABLE domain (
  domain_id			    VARCHAR		NOT NULL,
  domain_name		    VARCHAR		NOT NULL,
  domain_concept_id		INTEGER		NOT NULL
)
;


CREATE TABLE concept_class (
  concept_class_id			VARCHAR		NOT NULL,
  concept_class_name		VARCHAR		NOT NULL,
  concept_class_concept_id	INTEGER     NOT NULL
)
;


CREATE TABLE concept_relationship (
  concept_id_1			INTEGER			NOT NULL,
  concept_id_2			INTEGER			NOT NULL,
  relationship_id		VARCHAR			NOT NULL,
  valid_start_date		DATE			NOT NULL,
  valid_end_date		DATE			NOT NULL,
  invalid_reason		VARCHAR			NULL
  )
;


CREATE TABLE relationship (
  relationship_id			VARCHAR		NOT NULL,
  relationship_name			VARCHAR		NOT NULL,
  is_hierarchical			VARCHAR		NOT NULL,
  defines_ancestry			VARCHAR		NOT NULL,
  reverse_relationship_id	VARCHAR		NOT NULL,
  relationship_concept_id	INTEGER		NOT NULL
)
;


CREATE TABLE concept_synonym (
  concept_id			INTEGER			NOT NULL,
  concept_synonym_name	VARCHAR			NOT NULL,
  language_concept_id	INTEGER			NOT NULL
)
;


CREATE TABLE concept_ancestor (
  ancestor_concept_id		INTEGER		NOT NULL,
  descendant_concept_id		INTEGER		NOT NULL,
  min_levels_of_separation	INTEGER		NOT NULL,
  max_levels_of_separation	INTEGER		NOT NULL
)
;


CREATE TABLE source_to_concept_map (
  source_code				VARCHAR		NOT NULL,
  source_concept_id			INTEGER		NOT NULL,
  source_vocabulary_id		VARCHAR		NOT NULL,
  source_code_description	VARCHAR		NULL,
  target_concept_id			INTEGER		NOT NULL,
  target_vocabulary_id		VARCHAR		NOT NULL,
  valid_start_date			DATE		NOT NULL,
  valid_end_date			DATE		NOT NULL,
  invalid_reason			VARCHAR		NULL
)
;


CREATE TABLE drug_strength (
  drug_concept_id				INTEGER		  	NOT NULL,
  ingredient_concept_id			INTEGER		  	NOT NULL,
  amount_value					FLOAT		    NULL,
  amount_unit_concept_id		INTEGER		  	NULL,
  numerator_value				FLOAT		    NULL,
  numerator_unit_concept_id		INTEGER		  	NULL,
  denominator_value				FLOAT		    NULL,
  denominator_unit_concept_id	INTEGER		  	NULL,
  box_size						INTEGER		  	NULL,
  valid_start_date				DATE		    NOT NULL,
  valid_end_date				DATE		    NOT NULL,
  invalid_reason				VARCHAR  		NULL
)
;


/**************************

Standardized meta-data

***************************/


CREATE TABLE cdm_source
(
  cdm_source_name					VARCHAR		NOT NULL ,
  cdm_source_abbreviation			VARCHAR		NULL ,
  cdm_holder						VARCHAR		NULL ,
  source_description				VARCHAR		NULL ,
  source_documentation_reference	VARCHAR		NULL ,
  cdm_etl_reference					VARCHAR		NULL ,
  source_release_date				DATE		NULL ,
  cdm_release_date					DATE		NULL ,
  cdm_version						VARCHAR		NULL ,
  vocabulary_version				VARCHAR		NULL
)
;


CREATE TABLE metadata
(
  metadata_concept_id       INTEGER     NOT NULL ,
  metadata_type_concept_id  INTEGER     NOT NULL ,
  name                      VARCHAR  	NOT NULL ,
  value_as_string           VARCHAR  	NULL ,
  value_as_concept_id       INTEGER     NULL ,
  metadata_date             DATE        NULL ,
  metadata_datetime         TIMESTAMP   NULL
)
;

INSERT INTO metadata (metadata_concept_id, metadata_type_concept_id, name, value_as_string, value_as_concept_id, metadata_date, metadata_datetime) --Added cdm version record
VALUES (0,0,'CDM Version', '6.0',0,NULL,NULL)
;


/************************

Standardized clinical data

************************/


CREATE TABLE person
(
  person_id						INTEGER	NOT NULL , 
  gender_concept_id				INTEGER	  	NOT NULL ,
  year_of_birth					INTEGER	  	NOT NULL ,
  month_of_birth				INTEGER	  	NULL,
  day_of_birth					INTEGER	  	NULL,
  birth_datetime				TIMESTAMP	NULL,
  death_datetime				TIMESTAMP	NULL,
  race_concept_id				INTEGER		NOT NULL,
  ethnicity_concept_id			INTEGER	  	NOT NULL,
  location_id					INTEGER		NULL,
  provider_id					INTEGER		NULL,
  care_site_id					INTEGER  	NULL,
  person_source_value			VARCHAR 	NULL,
  gender_source_value			VARCHAR 	NULL,
  gender_source_concept_id		INTEGER		NOT NULL,
  race_source_value				VARCHAR 	NULL,
  race_source_concept_id		INTEGER		NOT NULL,
  ethnicity_source_value		VARCHAR 	NULL,
  ethnicity_source_concept_id	INTEGER		NOT NULL
)
;


CREATE TABLE observation_period
(
  observation_period_id				  INTEGER  	NOT NULL ,
  person_id							  INTEGER  	NOT NULL ,
  observation_period_start_date		  DATE		NOT NULL ,
  observation_period_end_date		  DATE		NOT NULL ,
  period_type_concept_id			  INTEGER	NOT NULL
)
;


CREATE TABLE specimen
(
  specimen_id					INTEGER		NOT NULL ,
  person_id						INTEGER		NOT NULL ,
  specimen_concept_id			INTEGER		NOT NULL ,
  specimen_type_concept_id		INTEGER		NOT NULL ,
  specimen_date					DATE		NULL ,
  specimen_datetime				TIMESTAMP	NOT NULL ,
  quantity						FLOAT		NULL ,
  unit_concept_id				INTEGER		NULL ,
  anatomic_site_concept_id		INTEGER		NOT NULL ,
  disease_status_concept_id		INTEGER	    NOT NULL ,
  specimen_source_id			VARCHAR		NULL ,
  specimen_source_value			VARCHAR		NULL ,
  unit_source_value				VARCHAR		NULL ,
  anatomic_site_source_value	VARCHAR		NULL ,
  disease_status_source_value 	VARCHAR		NULL
)
;


CREATE TABLE visit_occurrence
(
  visit_occurrence_id			INTEGER	NOT NULL ,
  person_id						INTEGER	NOT NULL ,
  visit_concept_id				INTEGER		NOT NULL ,
  visit_start_date				DATE		NULL ,
  visit_start_datetime			TIMESTAMP	NOT NULL ,
  visit_end_date			    DATE		NULL ,
  visit_end_datetime			TIMESTAMP	NOT NULL ,
  visit_type_concept_id			INTEGER		NOT NULL ,
  provider_id					INTEGER		NULL,
  care_site_id					INTEGER		NULL,
  visit_source_value			VARCHAR		NULL,
  visit_source_concept_id		INTEGER		NOT NULL ,
  admitted_from_concept_id      INTEGER     NOT NULL ,   
  admitted_from_source_value    VARCHAR 	NULL ,
  discharge_to_source_value		VARCHAR		NULL ,
  discharge_to_concept_id		INTEGER   	NOT NULL ,
  preceding_visit_occurrence_id	INTEGER		NULL
)
;


CREATE TABLE visit_detail
(
  visit_detail_id                    INTEGER  	NOT NULL ,
  person_id                          INTEGER  	NOT NULL ,
  visit_detail_concept_id            INTEGER    NOT NULL ,
  visit_detail_start_date            DATE       NULL ,
  visit_detail_start_datetime        TIMESTAMP  NOT NULL ,
  visit_detail_end_date              DATE       NULL ,
  visit_detail_end_datetime          TIMESTAMP  NOT NULL ,
  visit_detail_type_concept_id       INTEGER    NOT NULL ,
  provider_id                        INTEGER  	NULL ,
  care_site_id                       INTEGER  	NULL ,
  discharge_to_concept_id            INTEGER    NOT NULL ,
  admitted_from_concept_id           INTEGER    NOT NULL , 
  admitted_from_source_value         VARCHAR 	NULL ,
  visit_detail_source_value          VARCHAR 	NULL ,
  visit_detail_source_concept_id     INTEGER    NOT NULL ,
  discharge_to_source_value          VARCHAR 	NULL ,
  preceding_visit_detail_id          INTEGER  	NULL ,
  visit_detail_parent_id             INTEGER  	NULL ,
  visit_occurrence_id                INTEGER  	NOT NULL
)
;


CREATE TABLE procedure_occurrence
(
  procedure_occurrence_id		INTEGER		NOT NULL ,
  person_id						INTEGER		NOT NULL ,
  procedure_concept_id			INTEGER		NOT NULL ,
  procedure_date				DATE		NULL ,
  procedure_datetime			TIMESTAMP	NOT NULL ,
  procedure_type_concept_id		INTEGER		NOT NULL ,
  modifier_concept_id			INTEGER		NOT NULL ,
  quantity						INTEGER		NULL ,
  provider_id					INTEGER		NULL ,
  visit_occurrence_id			INTEGER		NULL ,
  visit_detail_id             	INTEGER     NULL ,
  procedure_source_value		VARCHAR		NULL ,
  procedure_source_concept_id	INTEGER		NOT NULL ,
  modifier_source_value		    VARCHAR		NULL 
)
;


CREATE TABLE drug_exposure
(
  drug_exposure_id				INTEGER	  	NOT NULL ,
  person_id						INTEGER	  	NOT NULL ,
  drug_concept_id				INTEGER	  	NOT NULL ,
  drug_exposure_start_date		DATE	  	NULL ,
  drug_exposure_start_datetime  TIMESTAMP	NOT NULL ,
  drug_exposure_end_date		DATE		NULL ,
  drug_exposure_end_datetime	TIMESTAMP	NOT NULL ,
  verbatim_end_date				DATE		NULL ,
  drug_type_concept_id			INTEGER		NOT NULL ,
  stop_reason					VARCHAR		NULL ,
  refills						INTEGER		NULL ,
  quantity						FLOAT		NULL ,
  days_supply					INTEGER		NULL ,
  sig							VARCHAR		NULL ,
  route_concept_id				INTEGER		NOT NULL ,
  lot_number					VARCHAR		NULL ,
  provider_id					INTEGER		NULL ,
  visit_occurrence_id			INTEGER		NULL ,
  visit_detail_id               INTEGER		NULL ,
  drug_source_value				VARCHAR		NULL ,
  drug_source_concept_id		INTEGER		NOT NULL ,
  route_source_value			VARCHAR		NULL ,
  dose_unit_source_value		VARCHAR		NULL
)
;


CREATE TABLE device_exposure
(
  device_exposure_id			  INTEGER		NOT NULL ,
  person_id						  INTEGER		NOT NULL ,
  device_concept_id			      INTEGER		NOT NULL ,
  device_exposure_start_date	  DATE			NULL ,
  device_exposure_start_datetime  TIMESTAMP		NOT NULL ,
  device_exposure_end_date		  DATE			NULL ,
  device_exposure_end_datetime    TIMESTAMP		NULL ,
  device_type_concept_id		  INTEGER		NOT NULL ,
  unique_device_id			      VARCHAR		NULL ,
  quantity						  INTEGER		NULL ,
  provider_id					  INTEGER		NULL ,
  visit_occurrence_id			  INTEGER		NULL ,
  visit_detail_id                 INTEGER    	NULL ,
  device_source_value			  VARCHAR		NULL ,
  device_source_concept_id		  INTEGER		NOT NULL
)
;


CREATE TABLE condition_occurrence
(
  condition_occurrence_id		INTEGER			NOT NULL ,
  person_id						INTEGER			NOT NULL ,
  condition_concept_id			INTEGER			NOT NULL ,
  condition_start_date			DATE			NULL ,
  condition_start_datetime		TIMESTAMP		NOT NULL ,
  condition_end_date			DATE			NULL ,
  condition_end_datetime		TIMESTAMP		NULL ,
  condition_type_concept_id		INTEGER			NOT NULL ,
  condition_status_concept_id	INTEGER			NOT NULL ,
  stop_reason					VARCHAR			NULL ,
  provider_id					INTEGER			NULL ,
  visit_occurrence_id			INTEGER			NULL ,
  visit_detail_id               INTEGER     	NULL ,
  condition_source_value		VARCHAR			NULL ,
  condition_source_concept_id	INTEGER			NOT NULL ,
  condition_status_source_value	VARCHAR			NULL
)
;


CREATE TABLE measurement
(
  measurement_id				INTEGER		NOT NULL ,
  person_id						INTEGER		NOT NULL ,
  measurement_concept_id		INTEGER		NOT NULL ,
  measurement_date				DATE		NULL ,
  measurement_datetime			TIMESTAMP	NOT NULL ,
  measurement_time              VARCHAR 	NULL,
  measurement_type_concept_id	INTEGER		NOT NULL ,
  operator_concept_id			INTEGER		NULL ,
  value_as_number				FLOAT		NULL ,
  value_as_concept_id			INTEGER		NULL ,
  unit_concept_id				INTEGER		NULL ,
  range_low					    FLOAT		NULL ,
  range_high					FLOAT		NULL ,
  provider_id					INTEGER		NULL ,
  visit_occurrence_id			INTEGER		NULL ,
  visit_detail_id               INTEGER  	NULL ,
  measurement_source_value		VARCHAR		NULL ,
  measurement_source_concept_id	INTEGER		NOT NULL ,
  unit_source_value				VARCHAR		NULL ,
  value_source_value			VARCHAR		NULL
)
;


CREATE TABLE note
(
  note_id						INTEGER		NOT NULL ,
  person_id						INTEGER		NOT NULL ,
  note_event_id         		INTEGER     NULL , 
  note_event_field_concept_id	INTEGER 	NOT NULL , 
  note_date						DATE		NULL ,
  note_datetime					TIMESTAMP	NOT NULL ,
  note_type_concept_id			INTEGER		NOT NULL ,
  note_class_concept_id 		INTEGER		NOT NULL ,
  note_title					VARCHAR		NULL ,
  note_text						VARCHAR  	NULL ,
  encoding_concept_id			INTEGER		NOT NULL ,
  language_concept_id			INTEGER		NOT NULL ,
  provider_id					INTEGER		NULL ,
  visit_occurrence_id			INTEGER		NULL ,
  visit_detail_id       		INTEGER     NULL ,
  note_source_value				VARCHAR		NULL
)
;


CREATE TABLE note_nlp
(
  note_nlp_id					INTEGER		NOT NULL ,
  note_id						INTEGER		NOT NULL ,
  section_concept_id			INTEGER		NOT NULL ,
  snippet						VARCHAR		NULL ,
  "offset"					    VARCHAR		NULL ,
  lexical_variant				VARCHAR		NOT NULL ,
  note_nlp_concept_id			INTEGER		NOT NULL ,
  nlp_system					VARCHAR		NULL ,
  nlp_date						DATE		NOT NULL ,
  nlp_datetime					TIMESTAMP	NULL ,
  term_exists					VARCHAR		NULL ,
  term_temporal					VARCHAR		NULL ,
  term_modifiers				VARCHAR		NULL ,
  note_nlp_source_concept_id	INTEGER		NOT NULL
)
;


CREATE TABLE observation
(
  observation_id					INTEGER		NOT NULL ,
  person_id						    INTEGER		NOT NULL ,
  observation_concept_id			INTEGER		NOT NULL ,
  observation_date				    DATE		NULL ,
  observation_datetime				TIMESTAMP	NOT NULL ,
  observation_type_concept_id	    INTEGER		NOT NULL ,
  value_as_number				    FLOAT		NULL ,
  value_as_string				    VARCHAR		NULL ,
  value_as_concept_id			    INTEGER		NULL ,
  qualifier_concept_id			    INTEGER		NULL ,
  unit_concept_id				    INTEGER		NULL ,
  provider_id					    INTEGER		NULL ,
  visit_occurrence_id			    INTEGER		NULL ,
  visit_detail_id               	INTEGER     NULL ,
  observation_source_value		  	VARCHAR		NULL ,
  observation_source_concept_id		INTEGER		NOT NULL ,
  unit_source_value				    VARCHAR		NULL ,
  qualifier_source_value			VARCHAR		NULL ,
  observation_event_id				INTEGER		NULL , 
  obs_event_field_concept_id		INTEGER		NOT NULL , 
  value_as_datetime					TIMESTAMP 	NULL
)
;


CREATE TABLE survey_conduct --Table added
(
  survey_conduct_id					  INTEGER		NOT NULL ,
  person_id						      INTEGER		NOT NULL ,
  survey_concept_id			  		  INTEGER		NOT NULL ,
  survey_start_date				   	  DATE			NULL ,
  survey_start_datetime			      TIMESTAMP		NULL ,
  survey_end_date					  DATE  		NULL ,
  survey_end_datetime				  TIMESTAMP		NOT NULL ,
  provider_id						  INTEGER    	NULL ,
  assisted_concept_id	  			  INTEGER		NOT NULL ,
  respondent_type_concept_id		  INTEGER		NOT NULL ,
  timing_concept_id					  INTEGER		NOT NULL ,
  collection_method_concept_id		  INTEGER		NOT NULL ,
  assisted_source_value		  		  VARCHAR		NULL ,
  respondent_type_source_value		  VARCHAR  		NULL ,
  timing_source_value				  VARCHAR		NULL ,
  collection_method_source_value	  VARCHAR		NULL ,
  survey_source_value				  VARCHAR		NULL ,
  survey_source_concept_id			  INTEGER		NOT NULL ,
  survey_source_identifier		      VARCHAR		NULL ,
  validated_survey_concept_id		  INTEGER		NOT NULL ,
  validated_survey_source_value		  VARCHAR		NULL ,
  survey_version_number				  VARCHAR		NULL ,
  visit_occurrence_id				  INTEGER		NULL ,
  visit_detail_id					  INTEGER		NULL ,
  response_visit_occurrence_id	  	  INTEGER		NULL
)
;


CREATE TABLE fact_relationship
(
  domain_concept_id_1			INTEGER		NOT NULL ,
  fact_id_1						INTEGER		NOT NULL ,
  domain_concept_id_2			INTEGER		NOT NULL ,
  fact_id_2						INTEGER		NOT NULL ,
  relationship_concept_id		INTEGER		NOT NULL
)
;



/************************

Standardized health system data

************************/


CREATE TABLE location
(
  location_id			INTEGER		NOT NULL ,
  address_1				VARCHAR		NULL ,
  address_2				VARCHAR		NULL ,
  city					VARCHAR		NULL ,
  state					VARCHAR		NULL ,
  zip					VARCHAR		NULL ,
  county				VARCHAR		NULL ,
  country				VARCHAR		NULL ,
  location_source_value VARCHAR		NULL ,
  latitude				FLOAT		NULL ,
  longitude				FLOAT		NULL
)
;


CREATE TABLE location_history --Table added
(
  location_history_id           INTEGER		NOT NULL ,
  location_id			        INTEGER		NOT NULL ,
  relationship_type_concept_id	INTEGER		NOT NULL ,  
  domain_id				        VARCHAR 	NOT NULL ,
  entity_id				        INTEGER		NOT NULL ,
  start_date			        DATE		NOT NULL ,
  end_date				        DATE		NULL
)
;


CREATE TABLE care_site
(
  care_site_id					INTEGER		NOT NULL ,
  care_site_name				VARCHAR		NULL ,
  place_of_service_concept_id	INTEGER		NOT NULL ,
  location_id					INTEGER		NULL ,
  care_site_source_value		VARCHAR		NULL ,
  place_of_service_source_value	VARCHAR		NULL
)
;


CREATE TABLE provider
(
  provider_id					INTEGER		NOT NULL ,
  provider_name					VARCHAR		NULL ,
  NPI							VARCHAR		NULL ,
  DEA							VARCHAR		NULL ,
  specialty_concept_id			INTEGER		NOT NULL ,
  care_site_id					INTEGER		NULL ,
  year_of_birth					INTEGER		NULL ,
  gender_concept_id				INTEGER		NULL ,
  provider_source_value			VARCHAR		NULL ,
  specialty_source_value		VARCHAR		NULL ,
  specialty_source_concept_id	INTEGER		NOT NULL ,
  gender_source_value			VARCHAR		NULL ,
  gender_source_concept_id		INTEGER		NOT NULL
)
;


/************************

Standardized health economics

************************/


CREATE TABLE payer_plan_period
(
  payer_plan_period_id			INTEGER	  	NOT NULL ,
  person_id						INTEGER	  	NOT NULL ,
  contract_person_id            INTEGER   	NULL ,
  payer_plan_period_start_date  DATE	  	NOT NULL ,
  payer_plan_period_end_date	DATE		NOT NULL ,
  payer_concept_id              INTEGER     NOT NULL ,
  plan_concept_id               INTEGER     NOT NULL ,
  contract_concept_id           INTEGER     NOT NULL ,
  sponsor_concept_id            INTEGER     NOT NULL ,
  stop_reason_concept_id        INTEGER     NOT NULL ,
  payer_source_value			VARCHAR	  	NULL ,
  payer_source_concept_id       INTEGER     NOT NULL ,
  plan_source_value				VARCHAR	  	NULL ,
  plan_source_concept_id        INTEGER     NOT NULL ,
  contract_source_value         VARCHAR   	NULL ,
  contract_source_concept_id    INTEGER     NOT NULL ,
  sponsor_source_value          VARCHAR   	NULL ,
  sponsor_source_concept_id     INTEGER     NOT NULL ,
  family_source_value			VARCHAR	  	NULL ,
  stop_reason_source_value      VARCHAR   	NULL ,
  stop_reason_source_concept_id INTEGER     NOT NULL
)
;


CREATE TABLE cost
(
  cost_id						INTEGER		NOT NULL ,
  person_id						INTEGER		NOT NULL,
  cost_event_id					INTEGER  	NOT NULL ,
  cost_event_field_concept_id	INTEGER		NOT NULL , 
  cost_concept_id				INTEGER		NOT NULL ,
  cost_type_concept_id		    INTEGER     NOT NULL ,
  currency_concept_id			INTEGER		NOT NULL ,
  cost							FLOAT		NULL ,
  incurred_date					DATE		NOT NULL ,
  billed_date					DATE		NULL ,
  paid_date						DATE		NULL ,
  revenue_code_concept_id		INTEGER		NOT NULL ,
  drg_concept_id			    INTEGER		NOT NULL ,
  cost_source_value				VARCHAR		NULL ,
  cost_source_concept_id	    INTEGER		NOT NULL ,
  revenue_code_source_value 	VARCHAR 	NULL ,
  drg_source_value			    VARCHAR		NULL ,
  payer_plan_period_id			INTEGER		NULL
)
;


/************************

Standardized derived elements

************************/


CREATE TABLE drug_era
(
  drug_era_id				INTEGER			NOT NULL ,
  person_id					INTEGER			NOT NULL ,
  drug_concept_id			INTEGER			NOT NULL ,
  drug_era_start_datetime	TIMESTAMP		NOT NULL ,
  drug_era_end_datetime		TIMESTAMP		NOT NULL ,
  drug_exposure_count		INTEGER			NULL ,
  gap_days					INTEGER			NULL
)
;


CREATE TABLE dose_era
(
  dose_era_id				INTEGER			NOT NULL ,
  person_id					INTEGER			NOT NULL ,
  drug_concept_id			INTEGER			NOT NULL ,
  unit_concept_id			INTEGER			NOT NULL ,
  dose_value				FLOAT			NOT NULL ,
  dose_era_start_datetime	TIMESTAMP		NOT NULL ,
  dose_era_end_datetime	    TIMESTAMP		NOT NULL
)
;


CREATE TABLE condition_era
(
  condition_era_id					INTEGER			NOT NULL ,
  person_id							INTEGER			NOT NULL ,
  condition_concept_id				INTEGER			NOT NULL ,
  condition_era_start_datetime		TIMESTAMP		NOT NULL ,
  condition_era_end_datetime		TIMESTAMP		NOT NULL ,
  condition_occurrence_count		INTEGER			NULL
)
;