diff --git a/sqlite_utils/cli.py b/sqlite_utils/cli.py
index 0af947d..c940b30 100644
--- a/sqlite_utils/cli.py
+++ b/sqlite_utils/cli.py
@@ -1474,7 +1474,7 @@ def create_table(
 @click.argument("table")
 @click.argument("new_table")
 @load_extension_option
-def create_table(path, table, new_table, load_extension):
+def duplicate(path, table, new_table, load_extension):
     """
     Create a duplicate of this table, copying across the schema and all row data.
     """
diff --git a/sqlite_utils/db.py b/sqlite_utils/db.py
index 4755ea2..a2a30f9 100644
--- a/sqlite_utils/db.py
+++ b/sqlite_utils/db.py
@@ -1,4 +1,3 @@
-from ast import Not
 from .utils import (
     chunks,
     hash_record,