创建索引
create [bitmap] index [user_schema.]<index_name>
on [user_schema.]<table_name>|<view_name> (列名 ASC|DESC [,...]| func_name(列名))
[reverse]
[cluster[user_schema.]聚簇]
[initrans n]
[maxtrans n]
[pctfree n ]
[storage storage]
[tablespace tablespace]
[no sort]
