diff --git a/sql.go b/sql.go
index 0164c4d..dcad268 100644
--- a/sql.go
+++ b/sql.go
@@ -142,12 +142,12 @@ func initDB() {
 	_, err = db.Exec(`CREATE TABLE obj_auction_announce (
 							 obj_id			BIGINT UNSIGNED NOT NULL
 							,lot_id         BIGINT UNSIGNED NOT NULL
-							,item			VARCHAR(80) NOT NULL
-							,condition		VARCHAR(32) NOT NULL
-							,quality		VARCHAR(32) NOT NULL
-							,seller         VARCHAR(32) NOT NULL
-							,buyer			VARCHAR(32) NOT NULL
-							,status			VARCHAR(32) NOT NULL
+							,item			VARCHAR(80)
+							,condition		VARCHAR(32)
+							,quality		VARCHAR(32)
+							,seller         VARCHAR(32)
+							,buyer			VARCHAR(32)
+							,status			VARCHAR(32)
 							,end			TIMESTAMP NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,UNIQUE KEY (lot_id)