Database schema:
CREATE TABLE Document_Subsets (
  Document_Subset_ID NUMBER PRIMARY KEY,
  Document_Subset_Name TEXT,
  Document_Subset_Details TEXT
);
CREATE TABLE Collection_Subsets (
  Collection_Subset_ID NUMBER PRIMARY KEY,
  Collection_Subset_Name TEXT,
  Collecrtion_Subset_Details TEXT
);
CREATE TABLE Document_Objects (
  Document_Object_ID NUMBER PRIMARY KEY,
  Parent_Document_Object_ID NUMBER,
  Owner TEXT,
  Description TEXT,
  Other_Details TEXT
);
CREATE TABLE Collections (
  Collection_ID NUMBER PRIMARY KEY,
  Parent_Collection_ID NUMBER,
  Collection_Name TEXT,
  Collection_Description TEXT
);
CREATE TABLE Documents_in_Collections (
  Document_Object_ID NUMBER PRIMARY KEY,
  Collection_ID NUMBER,
  FOREIGN KEY (Collection_ID) REFERENCES Collections(Collection_ID),
  FOREIGN KEY (Document_Object_ID) REFERENCES Document_Objects(Document_Object_ID)
);
CREATE TABLE Document_Subset_Members (
  Document_Object_ID NUMBER PRIMARY KEY,
  Related_Document_Object_ID NUMBER,
  Document_Subset_ID NUMBER,
  FOREIGN KEY (Document_Subset_ID) REFERENCES Document_Subsets(Document_Subset_ID),
  FOREIGN KEY (Related_Document_Object_ID) REFERENCES Document_Objects(Document_Object_ID),
  FOREIGN KEY (Document_Object_ID) REFERENCES Document_Objects(Document_Object_ID)
);
CREATE TABLE Collection_Subset_Members (
  Collection_ID NUMBER PRIMARY KEY,
  Related_Collection_ID NUMBER,
  Collection_Subset_ID NUMBER,
  FOREIGN KEY (Collection_Subset_ID) REFERENCES Collection_Subsets(Collection_Subset_ID),
  FOREIGN KEY (Related_Collection_ID) REFERENCES Collections(Collection_ID),
  FOREIGN KEY (Collection_ID) REFERENCES Collections(Collection_ID)
);

Question: List id of documents that in collection named Best but not in document subset Best for 2000.
SQL: SELECT DISTINCT T2.Document_Object_ID FROM Collections AS T1 JOIN Documents_in_Collections AS T2 ON T1.Collection_ID = T2.Collection_ID WHERE T1.Collection_Name = "Best" EXCEPT SELECT DISTINCT T3.Document_Object_ID FROM Document_Subset_Members AS T3 JOIN Document_Subsets AS T4 ON T3.Document_Subset_ID =  T4.Document_Subset_ID WHERE T4.Document_Subset_Name = "Best for 2000"

Question: How many documents owned by Marlin?
SQL: SELECT count(*) FROM Document_Objects WHERE OWNER = "Marlin";

Question: List all documents ids that are not the parent of other documents.
SQL: SELECT Document_Object_ID FROM Document_Objects EXCEPT SELECT Parent_Document_Object_ID FROM Document_Objects

Question: What are the document object ids of the objects owned by Marlin?
SQL: SELECT Parent_Document_Object_ID FROM Document_Objects WHERE OWNER  =  'Marlin'

Question: What is the collection name of a document owned by 'Ransom'?
SQL: SELECT T1.Collection_Name FROM Collections AS T1 JOIN Documents_in_Collections AS T2 ON T1.Collection_ID = T2.Collection_ID JOIN Document_Objects AS T3 ON T2.Document_object_id  =  T3.Document_object_id WHERE T3.owner  =  'Ransom'

Question: List all name of collections that are related to collection named Best.
SQL: SELECT DISTINCT T4.Collection_Name FROM Collection_Subset_Members AS T1 JOIN Collection_Subset_Members AS T2 ON T1.Related_Collection_ID = T2.Collection_ID JOIN Collections AS T3 ON T1.Collection_ID = T3.Collection_ID JOIN Collections AS T4 ON T2.Collection_ID = T4.Collection_ID WHERE T3.Collection_Name = "Best";

Question: What is the object id of the document objects?
SQL: SELECT Document_Object_ID FROM Document_Objects;

Question: For the document subset with the most number of different documents , what are the ids and names of the subset , as well as the number of documents ?
SQL: select t1.document_subset_id ,  t2.document_subset_name , count(distinct t1.document_object_id) from document_subset_members as t1 join document_subsets as t2 on t1.document_subset_id =  t2.document_subset_id group by t1.document_subset_id order by count(*) desc limit 1;

Question: What are the names of the collections that are related to the collection named Best?
SQL: SELECT DISTINCT T4.Collection_Name FROM Collection_Subset_Members AS T1 JOIN Collection_Subset_Members AS T2 ON T1.Related_Collection_ID = T2.Collection_ID JOIN Collections AS T3 ON T1.Collection_ID = T3.Collection_ID JOIN Collections AS T4 ON T2.Collection_ID = T4.Collection_ID WHERE T3.Collection_Name = "Best";

Question: What are the names of the collections that are not the parent of the other collections?
SQL: SELECT Collection_Name FROM Collections EXCEPT SELECT T2.Collection_Name FROM Collections AS T1 JOIN Collections AS T2 ON T1.Parent_Collection_ID = T2.Collection_ID;

Question: What are the different document object ids that are in the collection named Best but not in the subset named 'Best for 2000'?
SQL: SELECT DISTINCT T2.Document_Object_ID FROM Collections AS T1 JOIN Documents_in_Collections AS T2 ON T1.Collection_ID = T2.Collection_ID WHERE T1.Collection_Name = "Best" EXCEPT SELECT DISTINCT T3.Document_Object_ID FROM Document_Subset_Members AS T3 JOIN Document_Subsets AS T4 ON T3.Document_Subset_ID =  T4.Document_Subset_ID WHERE T4.Document_Subset_Name = "Best for 2000"

Question: List all documents's subset. List the subset's name.
SQL: SELECT Document_Subset_Name FROM Document_Subsets;

Question: What is the number of child documents for each parent document, and what are the ids of the parent documents?
SQL: SELECT T2.Document_Object_ID ,  count(*) FROM Document_Objects AS T1 JOIN Document_Objects AS T2 ON T1.Parent_Document_Object_ID = T2.Document_Object_ID GROUP BY T2.Document_Object_ID;

Question: What is the detail of document subset with name 'Best for 2000'?
SQL: SELECT Document_Subset_Details FROM Document_Subsets WHERE Document_Subset_Name = "Best for 2000";

Question: What are the collection subset ids, names, and number of collections for each subset?
SQL: SELECT T2.Collection_Subset_ID ,  T1.Collection_Subset_Name ,  count(*) FROM Collection_Subsets AS T1 JOIN Collection_Subset_Members AS T2 ON T1.Collection_Subset_ID =  T2.Collection_Subset_ID GROUP BY T2.Collection_Subset_ID;

Question: List all owner of documents that is related to documents owned by Braeden.
SQL: SELECT DISTINCT OWNER FROM Document_Subset_Members AS T1 JOIN Document_Objects AS T2 ON T1.Related_Document_Object_ID  =  T2.Document_Object_ID WHERE T2.Owner  =  'Braeden';

Question: What is the number of document object ids in the collection named Best?
SQL: SELECT T2.Document_Object_ID FROM Collections AS T1 JOIN Documents_in_Collections AS T2 ON T1.Collection_ID = T2.Collection_ID WHERE T1.Collection_Name = "Best";

Question: List the document id of all documents in collection named Best.
SQL: SELECT T2.Document_Object_ID FROM Collections AS T1 JOIN Documents_in_Collections AS T2 ON T1.Collection_ID = T2.Collection_ID WHERE T1.Collection_Name = "Best";

Question: What are the collection subsets that the collection named 'Best' in?
SQL: SELECT DISTINCT T1.Collection_Subset_Name FROM Collection_Subsets AS T1 JOIN Collection_Subset_Members AS T2 ON T1.Collection_Subset_ID =  T2.Collection_Subset_ID JOIN Collections AS T3 ON T2.Collection_ID =  T3.Collection_ID WHERE T3.Collection_Name = "Best";

Question: Which document has most of child? List the document id and the number of child.
SQL: SELECT T2.Document_Object_ID ,  count(*) FROM Document_Objects AS T1 JOIN Document_Objects AS T2 ON T1.Parent_Document_Object_ID = T2.Document_Object_ID GROUP BY T2.Document_Object_ID ORDER BY count(*) DESC LIMIT 1;

Question: List the Collection Name that document owned by 'Ransom ' belong to .
SQL: select t1.collection_name from collections as t1 join documents_in_collections as t2 on t1.collection_id = t2.collection_id join document_objects as t3 on t2.document_object_id  =  t3.document_object_id where t3.owner  =  'ransom'