Answer: D) None of the above
Explanation: The subschema differs from the schema in that one denotes the appearance of data in the Database Base Management System (DBMS) while the subschema which is also referred to as the external schema is that subset of the schema is visible or relevant to the user. Thus, It is the view of the database which is visible to an application program. Virtual tables in a database usually represents an object structures like a table which is the result of running certain database commands or functions such as the create table, view, select and so on. Virtual tables are not stored directly in database files.
Pope Urban II feared that the Seljuk Turks might keep Christians from visiting the Holy Land. .. or B
I would say Japan because they wanted to gain more land and resources
Democracy in the united kingdom was established in 1918. it became a democracy when the Representation of the People Acts of 1918 and 1928 gave all men and women over the age of 21 the right to vote.