more resources

Author: Wandalen

cs/learn.md

@@ -59,11 +59,17 @@ Donne Martin ](https://github.com/donnemartin) ( _systems_design_ )
 
 - [Low Level System Design](https://www.youtube.com/playlist?list=PL564gOx0bCLqTolRIHIsR2JPv11w8LESW) :mortar_board: :movie_camera: by [Udit Agarwal](https://www.youtube.com/c/anomaly2104/playlists)
 
+## Systems design courses
+
+- [System Design for Beginners](https://www.youtube.com/playlist?list=PL8hP5HjAnJ3_mT7IHXjlbpYX_xiz4v_kP) by [Code with Irtiza](https://www.youtube.com/@irtizahafiz) :mortar_board: :movie_camera:
+- [System Design Fundamentals](https://www.youtube.com/playlist?list=PL1MM4yIzUdPnU8n75kjTIbgewdLr5DFox) by [Software Interviews Prep](https://www.youtube.com/@SoftwareInterviewsPrep) :mortar_board: :movie_camera:
+- [System Design for Beginners](https://www.youtube.com/watch?v=m8Icp_Cid5o) by [freeCodeCamp](https://www.youtube.com/@freecodecamp) :mortar_board: :movie_camera:
+
 ## Systems design key concepts
 
 ( _systems_design_ )
 
--  [Distributed Systems](https://www.youtube.com/playlist?list=PLeKd45zvjcDFUEv_ohr_HdUFe97RItdiB) :mortar_board: :movie_camera: by [Martin Kleppmann](https://www.youtube.com/channel/UClB4KPy5LkJj1t3SgYVtMOQ/videos) ( _systems_design_ ) ( _distributed_system_ )
+- [Distributed Systems](https://www.youtube.com/playlist?list=PLeKd45zvjcDFUEv_ohr_HdUFe97RItdiB) :mortar_board: :movie_camera: by [Martin Kleppmann](https://www.youtube.com/channel/UClB4KPy5LkJj1t3SgYVtMOQ/videos) ( _systems_design_ ) ( _distributed_system_ )
 - [Moving from Monoliths to Microservices](https://www.youtube.com/watch?v=rckfN7xFig0) :movie_camera: by [Gaurav Sen](https://www.youtube.com/c/GauravSensei/videos) ( _systems_design_ )
 - [Microservices explained](https://www.youtube.com/watch?v=rv4LlmLmVWk) :movie_camera: by [TechWorld with Nana](https://www.youtube.com/c/TechWorldwithNana/videos)
 - [Microservices Explained and their Pros & Cons](https://www.youtube.com/watch?v=T-m7ZFxeg1A) :movie_camera: by [Hussein Nasser](https://www.youtube.com/c/HusseinNasser-software-engineering/videos)

dbms/concepts.md

@@ -691,8 +691,8 @@ Each table cell should contain a single value, and each record needs to be uniqu
 
 First level of database normalization that a database table must satisfy:
 - Using row order to convey information is not permitted.
-- Mixing data types within the same column is not permitted.
 - Having a table without a primary key is not permitted.
+- Mixing data types within the same column is not permitted.
 - Several values per cell is not permitted.
 
 > **Second Normal Form** ~ **2NF**
@@ -706,7 +706,7 @@ The table is in 1NF and all non-key attributes are fully functional dependent on
 Every non-key attribute in a table should depend on the key, the whole key, and nothing but the key.
 
 The table is in 2NF and all the attributes are functionally independent of any other non-primary-key attributes.
-3NF unlike BCND does preserve all functional dependencies, normalization does not lead to losing any of FDs.
+3NF unlike BCNF does preserve all functional dependencies, normalization does not lead to losing any of FDs.
 
 > **Boyce-Codd Normal Form** ~ **BCNF**
 

dbms/questions.md

@@ -71,6 +71,7 @@
 - Compare and contrast Common Table Expressions (CTEs) with views.
 - Describe the distinctions between views and synonyms, providing examples.
 - Compare views with materialized views in terms of functionality and usage.
+- How to avoid creating a view if you need to add few request-time columns?
 
 ## Index
 
@@ -86,7 +87,7 @@
 
 ###
 
-- Can foreign key refer non-primary key? When?
-- Can unqiue cooumn have duplicates? When?
-- Can foreign key refer nullable key?
+- Can foreign key refer non-primary key? When? Yes, if it has unique constraint
+- Can unqiue cooumn have duplicates? When? Only nulls.
+- Can foreign key refer nullable key? Yes
 - Can primary key field be changed?

dbms/skills.md

@@ -34,6 +34,8 @@
   - - - drop
   - - - constrains
   - - - views
+  - - - materialzid views
+  - - - prepare statement
   - - - stored column ~ generated column
   - - - synonym
   - - - truncate

digital_product/learn.md

@@ -11,6 +11,7 @@ Awesome list of high-quality study materials for learning Digital Product.
 
 - [Root cause analysis](https://www.youtube.com/playlist?list=PLxENun6kHfaB4vJsQAO4zXgDbXZ-1i8l_) by [skilltecs](https://www.youtube.com/@skilltecs) :movie_camera: :mortar_board:
 - [Root cause analysis](https://www.youtube.com/playlist?list=PL55ZwvYHxcu2QqhSl-NwKvIF8kUeww-JB) by [Lean and Six Sigma](https://www.youtube.com/@learnandapply) :movie_camera: :mortar_board:
+- [FMEA](https://www.youtube.com/playlist?list=PLHm5EVKgoDDSj-5mcaHSRQ66CrtCL0fj5) by [Paul Allen](https://www.youtube.com/@paulallen5321) :movie_camera: :mortar_board:
 
 ## Testing