diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 6fedc1d..9c6344c 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -1005,10 +1005,12 @@
 							- There are attributes that apply to some (but not all) instances of an entity.
 							- The instances of a potential subclass participate in a relationship unique to that subclass.
 					- LATER SQL
-					- Designing databases
+					- LATER Designing databases
 						- Understand Database Design Methodology
 							- Conceptual database design
+								- The process of constructing a model of the data used in an enterprise, independent of all physical considerations.
 							- Logical database design
+								-
 							- Physical database design
 						- general steps for Database Design Methodology.
 			- DONE Block 3