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pages/总复习2023t1.md

@@ -873,7 +873,6 @@
 		  :END:
 			- DONE Block 1
 			  deck:: 2023t1/database
-			  collapsed:: true
 				- DONE DBMS
 					- Database is :-> a shared collection of logically related data (and a description of this data), designed to meet the information needs of an organization.
 					  id:: 648974ba-3221-48b2-8f9c-2d9275174f48
@@ -955,10 +954,10 @@
 						  id:: 648974ba-9b7a-4543-b243-e7a78cfc8175
 							- a ternary relationship is not the same as three binary relationships!
 				- DONE basic concepts associated with Entity-Relationship(ER) model.
-				- LATER Forming sql queries
+				- DONE Forming sql queries
 					- DONE Review relational algebra https://www.geeksforgeeks.org/introduction-of-relational-algebra-in-dbms/
 					- LATER review lab2
-					- LATER SQL join
+					- DONE SQL join
 			- DONE Block 2
 				- DONE EER
 					- Most useful additional concept of EER model:
@@ -1024,7 +1023,6 @@
 						- purpose and importance of SQL.
 							- SQL is a transform-oriented language with 2
 							  id:: 6489c210-8ab6-4a38-979a-01af7618a3a4
-							  collapsed:: true
 							  major components: #flashcard
 								- A DDL for defining database structure.
 									- Create table
@@ -1047,7 +1045,7 @@
 							- Join tables together.
 							- Use subqueries.
 						- update database and formulate queries using INSERT, UPDATE, and DELETE.
-						- LATER [#A] Write some SQL!!
+						- DONE [#A] Write some SQL!!
 			- DONE Block 3
 				- DONE DB transaction management
 					- DONE Deadlock and how it can be resolved. #flashcard