See full CDM specification file on our github wiki or in the CDM V5.3.1 PDF

• #183 Fixes VISIT_DETAIL documentation, 'required' and 'type' columns were switched
• #169 Data type changes for BigQuery
• #171 Datetime formats in Sql Server changed to Datetime2
• #173 Impala reserved words
• #177 Postgres readme
• #140, #144, #135
  • Typos in readme and documentation
• #158 VOCABULARY.VOCABULARY_VERSION no longer a required field
• #157 Added MEASUREMENT.MEASUREMENT_TIME back to DDL for backwards compatibility
• #147 PAYER_PLAN_PERIOD.STOP_REASON_SOURCE_VALUE varchar instead of integer
• #120 PAYER_PLAN_PERIOD documentation
• #160 Removed errant semicolon in license header
• #145 VISIT_DETAIL naming convention
  • This is the change with the most potential impact as column names were updated
• #67 Removed COHORT_DEFINITION_ID foreign key constraint from COHORT table
• #16 Added additional foreign key constraints that were missing
• #12 .csv file is now delivered with each version
• Additional BigQuery updates for compatibility
• A portion of #112 was addressed
  • VISIT_DETAIL and documentation typos

• There is a development branch now available with the DDLs and documentation for tables and/or changes that have been accepted into a future version of the CDM. Please use these with caution as they are subject to change upon formal release
• BigQuery, Netezza, and Parallel Data Warehouse DDLs are now available

This repo contains the definition of the OMOP Common Data Model. It supports the SQL technologies: BigQuery, Impala, Netezza, Oracle, Parallel Data Warehouse, Postgres, Redshift, and SQL Server. For each, the DDL, constraints and indexes (if appropriate) are defined.

Versions are defined using tagging and versioning. Full versions (V6, 7 etc.) are usually released each year (1-Jan) and are not backwards compatible. Minor versions (V5.1, 5.2 etc.) are not guaranteed to be backwards compatible though an effort is made to make sure that current queries will not break. Micro versions (V5.1.1, V5.1.2 etc.) are released irregularly and often, and contain small hot fixes or backward compatible changes to the last minor version.