diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 2c64c00..900e690 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -1019,6 +1019,13 @@
 							- Physical database design
 					- LATER SQL
 						- purpose and importance of SQL.
+						- retrieve data from database and formulate queries using SELECT and
+							- Use compound WHERE conditions.
+							- Sort query results using ORDER BY.
+							- Use aggregate functions.
+							- Group data using GROUP BY and HAVING.
+							- Join tables together.
+							- Use subqueries.
 			- DONE Block 3
 			  collapsed:: true
 				- DONE DB transaction management