docref sql: add uniqueness constraint to publisher collections

git-svn-id: http://svn.parisson.org/svn/crem@90 3bf09e05-f825-4182-b9bc-eedd7160adf0

diff --git a/trunk/docref/crem.sql b/trunk/docref/crem.sql
index 0539d029da4ba5a37ad90b149193b69af65fc40b..b82405a5839c5f8141b0a9cc2872fa6dd6bdb189 100644 (file)
--- a/trunk/docref/crem.sql
+++ b/trunk/docref/crem.sql
@@ -111,7 +111,8 @@ CREATE TABLE publisher_collections (
     publisher_id    INTEGER NOT NULL,
     value           VARCHAR(250) NOT NULL,
 
-    FOREIGN KEY(publisher_id) REFERENCES publishers (id) ON DELETE CASCADE
+    FOREIGN KEY(publisher_id) REFERENCES publishers (id) ON DELETE CASCADE,
+    UNIQUE (publisher_id, value)
 ) ENGINE=InnoDB;
 
 --