1.over()
2.rownum()
3.connect by
4.proir
5.group by
6.start with
7.level
8.rownum
9.select
10.from
11.where
12.join
13.inner join
14.left join (+)
15.right join (+)
16.with as
17.is null
18.is not null
19.in
20.exists
21.not exists
22.and
23.length()
24.sum()
25.count()
26.min()
27.max()
28.avg()
30.union all
31.union
32.trim()
33.lpad()
34.rpad()
35.to_number()
36.cast()
37.nvl()
38.last_value()
39.first_value()
40.order by
41.partition
42.between and
44.to_char()
45.to_date()
46.rows
47.desc
48.asc
49.LEAD ：LEAD与LAG相反，LEAD可以访问组中当前行之后的行
50.LAG ：可以访问结果集中的其它行而不用进行自连接, 进行锉行显示,向下锉行
51.RANK ：根据ORDER BY子句中表达式的值，从查询返回的每一行，计算它们与其它行的相对位置,如果排序值相同,rank()值相同
52.DENSE_RANK ：根据ORDER BY子句中表达式的值，从查询返回的每一行，计算它们与其它行的相对位置,与rank相似,只是不会跳号
53.Listagg
54.within
55.WITH GROUP
56.REGEXP_SUBSTR
57.PIVOT
58.UNPIVOT
59.INTERSECT
60.MINUS
61.partition by
62.range
63.values less than
64.partition pn
65.Interval
66.loop
67.fetch
68.into
69.exit
70.when
71.%notfound
72.end loop
73.begin
74.end
75.declare
76.cursor
77.is
78.concat
79.||
80.DBMS_OUTPUT.PUT_LINE()
81.close
82.open
83.for..in..
84.%FOUND
85.%ROWCOUNT
86.type
87.NOCOPY
88.LAST_DAY()
