Update app.py

app.py

@@ -128,7 +128,7 @@ if submitted:
                 cursor = conn.cursor()
                 cursor.execute(sql_query)
                 results = cursor.fetchall()
-                columns = [desc[0] for desc in cursor.description]
+                column_names = [desc[0] for desc in cursor.description]
 
             st.subheader("Generated SQL")
             st.code(sql_query, language="sql")