diff --git a/Oracle/OMOP CDM oracle ddl.txt b/Oracle/OMOP CDM oracle ddl.txt
index 1a6783e..94a99c5 100644
--- a/Oracle/OMOP CDM oracle ddl.txt	
+++ b/Oracle/OMOP CDM oracle ddl.txt	
@@ -62,7 +62,7 @@ CREATE TABLE vocabulary (
   vocabulary_id			    VARCHAR(20)		NOT NULL,
   vocabulary_name		    VARCHAR(255)	NOT NULL,
   vocabulary_reference	VARCHAR(255)	NOT NULL,
-  vocabulary_version	  VARCHAR(255)	NOT NULL,
+  vocabulary_version	  VARCHAR(255)	NULL,
   vocabulary_concept_id	INTEGER			  NOT NULL
 )
 ;
@@ -650,7 +650,7 @@ CREATE TABLE cost
   payer_plan_period_id			INTEGER			NULL ,
   amount_allowed		        FLOAT			  NULL ,
   revenue_code_concept_id		INTEGER			NULL ,
-  reveue_code_source_value  VARCHAR(50) NULL,
+  revenue_code_source_value  VARCHAR(50) NULL,
   drg_concept_id			      INTEGER		  NULL,
   drg_source_value			    VARCHAR(3)	NULL
 )
diff --git a/ParallelDataWarehouse/OMOP CDM pdw ddl.txt b/ParallelDataWarehouse/OMOP CDM pdw ddl.txt
index 5a49470..100c6b9 100644
--- a/ParallelDataWarehouse/OMOP CDM pdw ddl.txt	
+++ b/ParallelDataWarehouse/OMOP CDM pdw ddl.txt	
@@ -60,7 +60,7 @@ WITH (DISTRIBUTION = REPLICATE);
 IF XACT_STATE() = 1 COMMIT; CREATE TABLE  vocabulary  (vocabulary_id			    VARCHAR(20)		NOT NULL,
   vocabulary_name		    VARCHAR(255)	NOT NULL,
   vocabulary_reference	VARCHAR(255)	NOT NULL,
-  vocabulary_version	  VARCHAR(255)	NOT NULL,
+  vocabulary_version	  VARCHAR(255)	NULL,
   vocabulary_concept_id	INTEGER			  NOT NULL
 )
 WITH (DISTRIBUTION = REPLICATE);
@@ -616,7 +616,7 @@ IF XACT_STATE() = 1 COMMIT; CREATE TABLE  cost
   payer_plan_period_id			INTEGER			NULL ,
   amount_allowed		        FLOAT			  NULL ,
   revenue_code_concept_id		INTEGER			NULL ,
-  reveue_code_source_value  VARCHAR(50) NULL,
+  revenue_code_source_value  VARCHAR(50) NULL,
   drg_concept_id			      INTEGER		  NULL,
   drg_source_value			    VARCHAR(3)	NULL
 )
diff --git a/PostgreSQL/OMOP CDM postgresql ddl.txt b/PostgreSQL/OMOP CDM postgresql ddl.txt
index 9e611f3..16179ce 100644
--- a/PostgreSQL/OMOP CDM postgresql ddl.txt	
+++ b/PostgreSQL/OMOP CDM postgresql ddl.txt	
@@ -62,7 +62,7 @@ CREATE TABLE vocabulary (
   vocabulary_id			    VARCHAR(20)		NOT NULL,
   vocabulary_name		    VARCHAR(255)	NOT NULL,
   vocabulary_reference	VARCHAR(255)	NOT NULL,
-  vocabulary_version	  VARCHAR(255)	NOT NULL,
+  vocabulary_version	  VARCHAR(255)	NULL,
   vocabulary_concept_id	INTEGER			  NOT NULL
 )
 ;
@@ -650,7 +650,7 @@ CREATE TABLE cost
   payer_plan_period_id			INTEGER			NULL ,
   amount_allowed		        NUMERIC			  NULL ,
   revenue_code_concept_id		INTEGER			NULL ,
-  reveue_code_source_value  VARCHAR(50) NULL,
+  revenue_code_source_value  VARCHAR(50) NULL,
   drg_concept_id			      INTEGER		  NULL,
   drg_source_value			    VARCHAR(3)	NULL
 )
diff --git a/Redshift/OMOP CDM redshift ddl.txt b/Redshift/OMOP CDM redshift ddl.txt
index ccebf0d..8b5e8e2 100644
--- a/Redshift/OMOP CDM redshift ddl.txt	
+++ b/Redshift/OMOP CDM redshift ddl.txt	
@@ -60,7 +60,7 @@ DISTSTYLE ALL;
 CREATE TABLE vocabulary  (vocabulary_id			    VARCHAR(20)		NOT NULL,
   vocabulary_name		    VARCHAR(255)	NOT NULL,
   vocabulary_reference	VARCHAR(255)	NOT NULL,
-  vocabulary_version	  VARCHAR(255)	NOT NULL,
+  vocabulary_version	  VARCHAR(255)	NULL,
   vocabulary_concept_id	INTEGER			  NOT NULL
 )
 DISTSTYLE ALL;
@@ -616,7 +616,7 @@ CREATE TABLE cost
   payer_plan_period_id			INTEGER			NULL ,
   amount_allowed		        FLOAT			  NULL ,
   revenue_code_concept_id		INTEGER			NULL ,
-  reveue_code_source_value  VARCHAR(50) NULL,
+  revenue_code_source_value  VARCHAR(50) NULL,
   drg_concept_id			      INTEGER		  NULL,
   drg_source_value			    VARCHAR(3)	NULL
 )
diff --git a/Sql Server/OMOP CDM sql server ddl.txt b/Sql Server/OMOP CDM sql server ddl.txt
index cc2c114..2f70c1d 100644
--- a/Sql Server/OMOP CDM sql server ddl.txt	
+++ b/Sql Server/OMOP CDM sql server ddl.txt	
@@ -62,7 +62,7 @@ CREATE TABLE vocabulary (
   vocabulary_id			    VARCHAR(20)		NOT NULL,
   vocabulary_name		    VARCHAR(255)	NOT NULL,
   vocabulary_reference	VARCHAR(255)	NOT NULL,
-  vocabulary_version	  VARCHAR(255)	NOT NULL,
+  vocabulary_version	  VARCHAR(255)	NULL,
   vocabulary_concept_id	INTEGER			  NOT NULL
 )
 ;
@@ -650,7 +650,7 @@ CREATE TABLE cost
   payer_plan_period_id			INTEGER			NULL ,
   amount_allowed		        FLOAT			  NULL ,
   revenue_code_concept_id		INTEGER			NULL ,
-  reveue_code_source_value  VARCHAR(50) NULL,
+  revenue_code_source_value  VARCHAR(50) NULL,
   drg_concept_id			      INTEGER		  NULL,
   drg_source_value			    VARCHAR(3)	NULL
 )