oracle資料庫關於時間間隔的函式

每天按每十五分鐘進行間隔的函式：

select to_char(trunc(sysdate) + (level) * 15 / (24 * 60), 'hh24:mi') date_jg,

rownum
from dual
connect by level < = 96--96是一天按15分鐘間隔一共是96行（級）

每天24小時分組函式：

select to_char(sysdate + rownum / 24, 'hh24') times

from dual
connect by rownum <= 24

按照指定的開始時間和結束時間每天是星期幾：

select rownum num,

to_char(to_date('2013-09-16', 'yyyy-mm-dd') - rownum, 'day') sdate,--星期幾
to_char(to_date('2013-09-23', 'yyyy-mm-dd') - rownum, 'dd') sday--幾號
from dual
connect by rownum <= 7
order by sday;

任意日期本月的分組函式：

select to_char(last_day(to_date(p_time, 'yyyy-mm')), 'dd')

into v_num
from dual;--先求出這個月一共有多少天，這個月的最後乙個日期既是當月的天數
select to_char(add_months(to_date('2013-09', 'yyyy-mm'), +1) - rownum, 'mm-dd') sday
from dual
connect by rownum <= 31;

每年12個月統計資料：

select b.road_id,

sum(decode(extract(month from b.sdate),
1,b.car_num,
0)) as jan,
sum(decode(extract(month from b.sdate),
2,b.car_num,
0)) as feb,
sum(decode(extract(month from b.sdate),
3,b.car_num,
0)) as mar,
sum(decode(extract(month from b.sdate),
4,b.car_num,
0)) as apr,
sum(decode(extract(month from b.sdate),
5,b.car_num,
0)) as may,
sum(decode(extract(month from b.sdate),
6,b.car_num,
0)) as june,
sum(decode(extract(month from b.sdate),
7,b.car_num,
0)) as july,
sum(decode(extract(month from b.sdate),
8,b.car_num,
0)) as aug,
sum(decode(extract(month from b.sdate),
9,b.car_num,
0)) as sep,
sum(decode(extract(month from b.sdate),
10,b.car_num,
0)) as oct,
sum(decode(extract(month from b.sdate),
11,b.car_num,
0)) as nov,
sum(decode(extract(month from b.sdate),
12,b.car_num,
0)) as dece
from tb_his_road60 b

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