diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index e31d266..6fedc1d 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -1006,6 +1006,11 @@
 							- The instances of a potential subclass participate in a relationship unique to that subclass.
 					- LATER SQL
 					- Designing databases
+						- Understand Database Design Methodology
+							- Conceptual database design
+							- Logical database design
+							- Physical database design
+						- general steps for Database Design Methodology.
 			- DONE Block 3
 			  collapsed:: true
 				- DONE DB transaction management