oracle當前時間 及轉換
select to_char(sysdate, 'yyyy-mm-dd hh24:mi:ss') now,
to_char(sysdate-interval '1' year, 'yyyy-mm-dd hh24') year1, -- 1 year ago
to_char(sysdate-10, 'yyyy-mm-dd hh24') day10, -- 10 day ago
to_char(sysdate-interval '1' day, 'yyyy-mm-dd hh24') day1,
to_char(sysdate-10 / 24, 'hh24:mi:ss') hour10,
to_char(sysdate-interval '1' hour, 'hh24:mi:ss') hour1,
to_char(sysdate-10 / (24*60), 'hh24:mi:ss') minute10,
to_char(sysdate-interval '1' minute, 'hh24:mi:ss') minute1,
to_char(sysdate-interval '1' second, 'hh24:mi:ss') second1
from dual;
---左連線
select t1.a_id, t1.a.name from tablea t1, tableb t2 where t1.a_id = t2.b_id(+);
--with as語句使用
with id2t as(
select distinct id, type from tableroot
id2n as(
select id, name from user
select a.id, id2n.name, id2t.type, money
from tablemoney a, id2t, id2n
where a.id=id2t.id and a.id=id2n.id
--動態字段
with cols as
( select wm_concat('t.'||col_name) col
from ( select upper(column_name) col_name from all_tab_cols
where table_name = upper('p_a_users_v') and owner=upper('own_a')
and column_name not in ('id', 'date')
select 'select t.date, t.id, '||cols.col||' from p_a_users_v where date= to_date('
'$flag'
','
'mm-dd-yyyy'
') ' from cols;
--其中 || 符號是字串連線符
--wm_concat函式可以將多個行連線為乙個字串並以逗號分隔
--字串中出現單引號時，多乙個單引號用於轉義
-- 字串轉行
with tmp as ( select 'name1, name2, name3, name4, id1, id2' colnamesstr from dual
),cols as ( select regexp_substr(colnamesstr, '[^,]+', 1, rownum) colname from tmp
connect by rownum--行轉列******************************=
month tid amount
----- --- --------
1 1 1000
2 1 1500
3 1 2000
1 2 999
2 2 1200
3 2 2500
1 3 888
2 3 1800
3 3 2100
------------------------------
select * from (
select month, tid, amount
from all_sales
where year = 2003
)pivot(
sum(amount) for month in (1 as jan, 2 as feb, 3 as mar， 4 as apr)
)order by tid;
-- 列轉行
with alldata as (
select id, code1, code2, code3, name1, name2, name3,
nvl( regexp_substr(codedesc, '[^,]+', 1, 1), 'unknow') desc1,
nvl( regexp_substr(codedesc, '[^,]+', 1, 2), 'unknow') desc2,
nvl( regexp_substr(codedesc, '[^,]+', 1, 3), 'unknow') desc3
from own.table1
)select * from (
select distinct id, code, name, codedesc
from alldata unpivot( (code, codedesc, name) for dd in (
(code1, desc1, name1),
(code2, desc2, name2),
(code3, desc3, name3), ))
where code is not null
)t order by code,name
-- pivot子句是oracle database 11g
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