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Why doesn't the DDL for Microsoft SQL Server use a clustered primary key? Why does it instead use an index that is essentially a duplicate of the primary key, thereby using up more resources (storage…
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Hi there!
I've been playing around trying to get the DDLs loaded for sqlite3, version 5.4 using the `sqlite3` command line and I've been having a pretty rough go of it using the provided definition…
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Discussion on DEVICE-WG Vocabulary Improvements
In addition to CDM changes here Changes DEVICE-WG Vocabulary Improvements here https://github.com/OHDSI/CommonDataModel/issues/353
Device WG propo…
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## WIKI-文档
### 1、[从零开始OHDSI](http://www.ohdsi.org/web/wiki/doku.php?id=documentation:getting_started)
1) 第一步将自己的数据[导成](http://www.ohdsi.org/web/wiki/doku.php?id=documentation:etl_best_practices) OMOP…
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@mvankessel-EMC it would be nice if targetCohorts, eventCohorts, and exitCohorts were allowed to be in different tables in the cdm. This would provide some more flexibility in the analysis, as we may …
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**Describe the problem**
PCR tests source codes in gold are:
37310282 | 1240581000000104 | Severe acute respiratory syndrome coronavirus 2 detected | Clinical Finding | Non-standard | Val…
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**Issue Name** Representation of Advance Directives
**Issue Type:** Lack of an ETL convention for a CDM table and/or field, ways to store source data in the OMOP CDM to represent an idea of interes…
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The bradycardia instantiation cohort portion of the package is hanging for me under PostgreSQL for my MDCR MarketScan database but not my CCAE MarketScan database. It has been running 9 hours on the …
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@daniprietoalhambra due to the quirkyness of the the THIN databases and they are not capturing mortality - this is giving us differences between prevalence between GOLD and THIN databases as well as o…
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# How to store family history in the OBSERVATION table
## CDM or THEMIS convention?
CDM
## Table or Field level?
Table
## Is this a general convention?
No
## Summary of issues
1. If these is an es…