Index: /branches/version-2_11-dev/html/install/sql/create_table_mysql.sql
===================================================================
--- /branches/version-2_11-dev/html/install/sql/create_table_mysql.sql	(revision 20870)
+++ /branches/version-2_11-dev/html/install/sql/create_table_mysql.sql	(revision 20887)
@@ -1135,12 +1135,12 @@
 CREATE TABLE dtb_plugin (
     plugin_id int NOT NULL,
-    plugin_name varchar(255) NOT NULL DEFAULT '',
+    plugin_name varchar(255) NOT NULL,
     plugin_code varchar(255) NOT NULL,
-    author varchar(255) NOT NULL DEFAULT '',
-    plugin_site_url varchar(255) NOT NULL DEFAULT '',
-    plugin_version varchar(255) NOT NULL DEFAULT '',
-    plugin_description varchar(255) NOT NULL DEFAULT '',
-    plugin_setting_path varchar(255) NOT NULL DEFAULT '',
-    class_name varchar(255) NOT NULL DEFAULT '',
+    author varchar(255),
+    plugin_site_url varchar(255),
+    plugin_version varchar(255),
+    plugin_description varchar(255),
+    plugin_setting_path varchar(255),
+    class_name varchar(255) NOT NULL,
     rank int NOT NULL DEFAULT 0,
     status smallint NOT NULL DEFAULT 0,
@@ -1162,6 +1162,6 @@
 
 CREATE TABLE dtb_index_list (
-    table_name varchar(30) NOT NULL DEFAULT '',
-    column_name varchar(30) NOT NULL DEFAULT '',
+    table_name varchar(30) NOT NULL,
+    column_name varchar(30) NOT NULL,
     recommend_flg smallint NOT NULL DEFAULT 0,
     recommend_comment text,
Index: /branches/version-2_11-dev/html/install/sql/create_table_pgsql.sql
===================================================================
--- /branches/version-2_11-dev/html/install/sql/create_table_pgsql.sql	(revision 20870)
+++ /branches/version-2_11-dev/html/install/sql/create_table_pgsql.sql	(revision 20887)
@@ -1135,12 +1135,12 @@
 CREATE TABLE dtb_plugin (
     plugin_id int NOT NULL,
-    plugin_name text NOT NULL DEFAULT '',
+    plugin_name text NOT NULL,
     plugin_code text NOT NULL,
-    author text NOT NULL DEFAULT '',
-    plugin_site_url text NOT NULL DEFAULT '',
-    plugin_version text NOT NULL DEFAULT '',
-    plugin_description text NOT NULL DEFAULT '',
-    plugin_setting_path text NOT NULL DEFAULT '',
-    class_name text NOT NULL DEFAULT '',
+    author text,
+    plugin_site_url text,
+    plugin_version text,
+    plugin_description text,
+    plugin_setting_path text,
+    class_name text NOT NULL,
     rank int NOT NULL DEFAULT 0,
     status smallint NOT NULL DEFAULT 0,
@@ -1162,6 +1162,6 @@
 
 CREATE TABLE dtb_index_list (
-    table_name text NOT NULL DEFAULT '',
-    column_name text NOT NULL DEFAULT '',
+    table_name text NOT NULL,
+    column_name text NOT NULL,
     recommend_flg smallint NOT NULL DEFAULT 0,
     recommend_comment text,