View
http://blog.csdn.net/tianlesoftware/article/details/5530618
MATERIALIZED VIEW
http://blog.csdn.net/tianlesoftware/article/details/4713553
ALTER MATERIALIZED VIEW
https://docs.oracle.com/database/121/SQLRF/statements_2002.htm#SQLRF00808
View
http://blog.csdn.net/tianlesoftware/article/details/5530618
MATERIALIZED VIEW
http://blog.csdn.net/tianlesoftware/article/details/4713553
https://docs.oracle.com/database/121/SQLRF/statements_2002.htm#SQLRF00808