added UNIQUE constraint

OHDSI · Mar 13, 2020 · 8f4a7fb · 8f4a7fb
1 parent 3d20bad
commit 8f4a7fb
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/working/DevV5_DDL.sql b/working/DevV5_DDL.sql
@@ -61,7 +61,7 @@ CREATE TABLE concept_ancestor (
 DROP TABLE IF EXISTS relationship CASCADE;
 CREATE TABLE relationship (
 	relationship_id VARCHAR (20) NOT NULL,
-	relationship_name VARCHAR (255) NOT NULL,
+	relationship_name VARCHAR (255) NOT NULL UNIQUE,
 	is_hierarchical int NOT NULL,
 	defines_ancestry int2 NOT NULL,
 	reverse_relationship_id VARCHAR (20) NOT NULL,