diff --git a/lib/nntp/tiny/db.py b/lib/nntp/tiny/db.py
index bd3c837..70d92d1 100644
--- a/lib/nntp/tiny/db.py
+++ b/lib/nntp/tiny/db.py
@@ -55,34 +55,9 @@ class Database():
     def add(self, obj):
         table = type(obj)
         sql   = f"insert into {table.name} ("
-
-        first = True
-
-        for column in table.columns:
-            if column == table.key:
-                continue
-
-            if first:
-                sql  += column
-                first = False
-            else:
-                sql += ', ' + column
-
+        sql += ", ".join([c for c in table.columns if c != table.key])
         sql += ') values ('
-
-        first = True
-
-        for column in table.columns:
-            if column == table.key:
-                continue
-
-            if first:
-                first = False
-            else:
-                sql += ', '
-
-            sql += '?'
-
+        sql += ", ".join(['?' for c in table.columns if c != table.key])
         sql += ')'
 
         fn = getattr(obj, '__values__')