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我的联系方式:
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我坚持一日三思,所以我的blog每天都会更新,除非我无法上网!(^_^)
我的联系方式:
QQ:363978818 Msn/mail:yonghe169@163.com
删除两个表重复的数据
[
2008/05/10 09:44 | by fubin ]
2008/05/10 09:44 | by fubin ]
delete
from schema.table1 t1
where t1.rowid >
(select
min (t2.rowid)
from schema.table1 t2
where t1.fcn = t2.fcn);
from schema.table1 t1
where t1.rowid >
(select
min (t2.rowid)
from schema.table1 t2
where t1.fcn = t2.fcn);
按照一个规则分割某个字符串,并把字符穿
[
2008/05/07 16:23 | by fubin ]
2008/05/07 16:23 | by fubin ]
在Oracle中实现Java Split方法,我有做了一个改进,既可以将某个字符串,分割以后,将任何段组合成为一个新的String.
CREATE OR REPLACE TYPE ty_str_split IS TABLE OF VARCHAR2 (4000);
CREATE OR REPLACE FUNCTION fn_split (p_str IN VARCHAR2, p_delimiter IN VARCHAR2)
RETURN ty_str_split
IS
j INT := 0;
i INT := 1;
len INT := 0;
len1 INT := 0;
str VARCHAR2 (4000);
str_split ty_str_split := ty_str_split ();
BEGIN
len := LENGTH (p_str);
len1 := LENGTH (p_delimiter);
WHILE j < len
LOOP
j := INSTR (p_str, p_delimiter, i);
IF j = 0
THEN
j := len;
str := SUBSTR (p_str, i);
str_split.EXTEND;
str_split (str_split.COUNT) := str;
IF i >= len
THEN
EXIT;
END IF;
ELSE
str := SUBSTR (p_str, i, j - i);
i := j + len1;
str_split.EXTEND;
str_split (str_split.COUNT) := str;
END IF;
END LOOP;
RETURN str_split;
END fn_split;
/
--取得从开始到某个位置的所有字符串的累加
CREATE OR REPLACE FUNCTION fn_split_b (p_str IN VARCHAR2, p_delimiter IN VARCHAR2,my_flag in integer)
RETURN string as
cursor c(s_p_str VARCHAR2, s_p_delimiter VARCHAR2)
IS
SELECT * FROM TABLE (CAST (fn_split (s_p_str, s_p_delimiter) AS ty_str_split));
r c%ROWTYPE;
temp_Var varchar2(255) :='';
temp_int integer :=1;
BEGIN
OPEN c(p_str,p_delimiter);
LOOP
FETCH c INTO r;
EXIT WHEN temp_int>my_flag;
temp_int:=temp_int+1;
temp_Var:=temp_Var||r.column_value;
END LOOP;
return temp_Var;
CLOSE c;
END;
CREATE OR REPLACE TYPE ty_str_split IS TABLE OF VARCHAR2 (4000);
CREATE OR REPLACE FUNCTION fn_split (p_str IN VARCHAR2, p_delimiter IN VARCHAR2)
RETURN ty_str_split
IS
j INT := 0;
i INT := 1;
len INT := 0;
len1 INT := 0;
str VARCHAR2 (4000);
str_split ty_str_split := ty_str_split ();
BEGIN
len := LENGTH (p_str);
len1 := LENGTH (p_delimiter);
WHILE j < len
LOOP
j := INSTR (p_str, p_delimiter, i);
IF j = 0
THEN
j := len;
str := SUBSTR (p_str, i);
str_split.EXTEND;
str_split (str_split.COUNT) := str;
IF i >= len
THEN
EXIT;
END IF;
ELSE
str := SUBSTR (p_str, i, j - i);
i := j + len1;
str_split.EXTEND;
str_split (str_split.COUNT) := str;
END IF;
END LOOP;
RETURN str_split;
END fn_split;
/
--取得从开始到某个位置的所有字符串的累加
CREATE OR REPLACE FUNCTION fn_split_b (p_str IN VARCHAR2, p_delimiter IN VARCHAR2,my_flag in integer)
RETURN string as
cursor c(s_p_str VARCHAR2, s_p_delimiter VARCHAR2)
IS
SELECT * FROM TABLE (CAST (fn_split (s_p_str, s_p_delimiter) AS ty_str_split));
r c%ROWTYPE;
temp_Var varchar2(255) :='';
temp_int integer :=1;
BEGIN
OPEN c(p_str,p_delimiter);
LOOP
FETCH c INTO r;
EXIT WHEN temp_int>my_flag;
temp_int:=temp_int+1;
temp_Var:=temp_Var||r.column_value;
END LOOP;
return temp_Var;
CLOSE c;
END;

The tiny village of Moriusaq stands on the frozen landscape of northwest Greenland. The sea ice near this settlement used to be thick enough to travel and hunt on for hundreds of miles for up to ten months. Recently though, climate change has reduced this crucial window to just a few weeks each year.
这是一个位于格林兰西北部冻土地区的Moriusaq小村庄,以往这些地区的冰层在冻结以后通常可以供人们在上面行动10个月左右,但是由于最近气候变化造成了这种情况只能一年持续数周。
Joboss中文问题解决方案
[
2008/04/29 09:37 | by fubin ]
2008/04/29 09:37 | by fubin ]
现象:在Web浏览器中,点击中文的Link,传过去的值是乱码。
解决方案:修改配置
文件地址:
M:\jboss-4.0.5.GA\server\all\deploy\jbossweb-tomcat55.sar \server.xml
修改内容:
将 disableUploadTimeout="true" URIEncoding="GBK" useBodyEncodingForURI="true" 文字配置加入其中。
例如:
<!-- A HTTP/1.1 Connector on port 8080 -->
<Connector port="8080" address="${jboss.bind.address}"
maxThreads="250" strategy="ms" maxHttpHeaderSize="8192"
emptySessionPath="true"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="GBK" useBodyEncodingForURI="true"/>
<!-- Add this option to the connector to avoid problems with
.NET clients that don't implement HTTP/1.1 correctly
restrictedUserAgents="^.*MS Web Services Client Protocol 1.1.4322.*$"
-->
<!-- A AJP 1.3 Connector on port 8009 -->
<Connector port="8009" address="${jboss.bind.address}"
emptySessionPath="true" enableLookups="false" redirectPort="8443"
protocol="AJP/1.3"/>
解决方案:修改配置
文件地址:
M:\jboss-4.0.5.GA\server\all\deploy\jbossweb-tomcat55.sar \server.xml
修改内容:
将 disableUploadTimeout="true" URIEncoding="GBK" useBodyEncodingForURI="true" 文字配置加入其中。
例如:
<!-- A HTTP/1.1 Connector on port 8080 -->
<Connector port="8080" address="${jboss.bind.address}"
maxThreads="250" strategy="ms" maxHttpHeaderSize="8192"
emptySessionPath="true"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="GBK" useBodyEncodingForURI="true"/>
<!-- Add this option to the connector to avoid problems with
.NET clients that don't implement HTTP/1.1 correctly
restrictedUserAgents="^.*MS Web Services Client Protocol 1.1.4322.*$"
-->
<!-- A AJP 1.3 Connector on port 8009 -->
<Connector port="8009" address="${jboss.bind.address}"
emptySessionPath="true" enableLookups="false" redirectPort="8443"
protocol="AJP/1.3"/>
P2P标准服务器代码
[
2008/04/27 17:30 | by fubin ]
2008/04/27 17:30 | by fubin ]
Oracle时间处理方法大全(网上收集)
[
2008/04/23 09:29 | by fubin ]
2008/04/23 09:29 | by fubin ]
TO_DATE格式
Day:
dd number 12
dy abbreviated fri
day spelled out friday
ddspth spelled out, ordinal twelfth
Month:
mm number 03
mon abbreviated mar
month spelled out march
Year:
yy two digits 98
yyyy four digits 1998
24小时格式下时间范围为: 0:00:00 - 23:59:59....
12小时格式下时间范围为: 1:00:00 - 12:59:59 ....
1.
日期和字符转换函数用法(to_date,to_char)
2.
select to_char( to_date(222,'J'),'Jsp') from dual
显示Two Hundred Twenty-Two
3.
求某天是星期几
select to_char(to_date('2002-08-26','yyyy-mm-dd'),'day') from dual;
星期一
select to_char(to_date('2002-08-26','yyyy-mm-dd'),'day','NLS_DATE_LANGUAGE = American') from dual;
monday
设置日期语言
ALTER SESSION SET NLS_DATE_LANGUAGE='AMERICAN';
也可以这样
TO_DATE ('2002-08-26', 'YYYY-mm-dd', 'NLS_DATE_LANGUAGE = American')
4.
两个日期间的天数
select floor(sysdate - to_date('20020405','yyyymmdd')) from dual;
5. 时间为null的用法
select id, active_date from table1
UNION
select 1, TO_DATE(null) from dual;
注意要用TO_DATE(null)
6.
a_date between to_date('20011201','yyyymmdd') and to_date('20011231','yyyymmdd')
那么12月31号中午12点之后和12月1号的12点之前是不包含在这个范围之内的。
所以,当时间需要精确的时候,觉得to_char还是必要的
7. 日期格式冲突问题
输入的格式要看你安装的ORACLE字符集的类型, 比如: US7ASCII, date格式的类型就是: '01-Jan-01'
alter system set NLS_DATE_LANGUAGE = American
alter session set NLS_DATE_LANGUAGE = American
或者在to_date中写
select to_char(to_date('2002-08-26','yyyy-mm-dd'),'day','NLS_DATE_LANGUAGE = American') from dual;
注意我这只是举了NLS_DATE_LANGUAGE,当然还有很多,
可查看
select * from nls_session_parameters
select * from V$NLS_PARAMETERS
日期和字符转换函数用法(to_date,to_char)
We overwrite NLS_DATE_FORMAT into different formats for the session.
SQL> alter session set nls_date_format = 'DD-MON-RR'; Session altered.
SQL> set pagesize 0
SQL> set linesize 130
SQL> select * from nls_session_parameters;
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZH:TZM
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZH:TZM
NLS_DUAL_CURRENCY $
NLS_COMP BINARY
15 rows selected.
specify it in SQL statement:
SQL> select to_date('03-SEP-1999','DD-MON-YYYY') from dual;
03-SEP-99
SQL> alter session set nls_date_format = 'MM-DD-YYYY';
Session altered.
SQL> select to_date('03-SEP-99','DD-MON-YY') from dual;
TO_DATE('0
----------
09-03-1999
SQL> alter session set nls_date_format = 'RRRR-MM-DD';
Session altered.
SQL> select to_date('03-SEP-1999','DD-MON-YYYY') from dual;
TO_DATE('0
----------
1999-09-03
When we use TO_CHAR function, we get expected results of format from current SQL statement:
SQL> alter session set nls_date_format = 'MM-DD-YY';
Session altered.
SQL> select to_char(sysdate,'dd-mm-yyyy') from dual;
TO_CHAR(SYSDATE,'DD-MM-YYYY')
07-09-1999
SQL> alter session set nls_date_format = 'RR-MON-DD';
Session altered.
SQL> select to_char(sysdate,'dd-mon-yy') from dual;
TO_CHAR(SYSDATE,'DD-MON-YY')
07-sep-99
SQL> select to_char(sysdate,'dd-Mon-yy') from dual;
TO_CHAR(SYSDATE,'DD-MON-YY')
07-Sep-99
8.
select count(*)
from ( select rownum-1 rnum
from all_objects
where rownum <= to_date('2002-02-28','yyyy-mm-dd') - to_date('2002-
02-01','yyyy-mm-dd')+1
)
where to_char( to_date('2002-02-01','yyyy-mm-dd')+rnum-1, 'D' )
not
in ( '1', '7' )
查找2002-02-28至2002-02-01间除星期一和七的天数
在前后分别调用DBMS_UTILITY.GET_TIME, 让后将结果相减(得到的是1/100秒, 而不是毫秒).
9.
select months_between(to_date('01-31-1999','MM-DD-YYYY'),
to_date('12-31-1998','MM-DD-YYYY')) "MONTHS" FROM DUAL;
1
select months_between(to_date('02-01-1999','MM-DD-YYYY'),
to_date('12-31-1998','MM-DD-YYYY')) "MONTHS" FROM DUAL;
1.03225806451613
10. Next_day的用法
Next_day(date, day)
Monday-Sunday, for format code DAY
Mon-Sun, for format code DY
1-7, for format code D
11
select to_char(sysdate,'hh:mi:ss') TIME from all_objects
注意:第一条记录的TIME 与最后一行是一样的
可以建立一个函数来处理这个问题
create or replace function sys_date return date is
begin
return sysdate;
end;
select to_char(sys_date,'hh:mi:ss') from all_objects;
12.
获得小时数
SELECT EXTRACT(HOUR FROM TIMESTAMP '2001-02-16 2:38:40') from offer
SQL> select sysdate ,to_char(sysdate,'hh') from dual;
SYSDATE TO_CHAR(SYSDATE,'HH')
-------------------- ---------------------
2003-10-13 19:35:21 07
SQL> select sysdate ,to_char(sysdate,'hh24') from dual;
SYSDATE TO_CHAR(SYSDATE,'HH24')
-------------------- -----------------------
2003-10-13 19:35:21 19
获取年月日与此类似
13.
年月日的处理
select older_date,
newer_date,
years,
months,
abs(
trunc(
newer_date-
add_months( older_date,years*12+months )
)
) days
from ( select
trunc(months_between( newer_date, older_date )/12) YEARS,
mod(trunc(months_between( newer_date, older_date )),
12 ) MONTHS,
newer_date,
older_date
from ( select hiredate older_date,
add_months(hiredate,rownum)+rownum newer_date
from emp )
)
14.
处理月份天数不定的办法
select to_char(add_months(last_day(sysdate) +1, -2), 'yyyymmdd'),last_day(sysdate) from dual
16.
找出今年的天数
select add_months(trunc(sysdate,'year'), 12) - trunc(sysdate,'year') from dual
闰年的处理方法
to_char( last_day( to_date('02' || :year,'mmyyyy') ), 'dd' )
如果是28就不是闰年
17.
yyyy与rrrr的区别
'YYYY99 TO_C
------- ----
yyyy 99 0099
rrrr 99 1999
yyyy 01 0001
rrrr 01 2001
18.不同时区的处理
select to_char( NEW_TIME( sysdate, 'GMT','EST'), 'dd/mm/yyyy hh:mi:ss') ,sysdate
from dual;
19.
5秒钟一个间隔
Select TO_DATE(FLOOR(TO_CHAR(sysdate,'SSSSS')/300) * 300,'SSSSS') ,TO_CHAR(sysdate,'SSSSS')
from dual
2002-11-1 9:55:00 35786
SSSSS表示5位秒数
20.
一年的第几天
select TO_CHAR(SYSDATE,'DDD'),sysdate from dual
310 2002-11-6 10:03:51
21.计算小时,分,秒,毫秒
select
Days,
A,
TRUNC(A*24) Hours,
TRUNC(A*24*60 - 60*TRUNC(A*24)) Minutes,
TRUNC(A*24*60*60 - 60*TRUNC(A*24*60)) Seconds,
TRUNC(A*24*60*60*100 - 100*TRUNC(A*24*60*60)) mSeconds
from
(
select
trunc(sysdate) Days,
sysdate - trunc(sysdate) A
from dual
)
9i以上版本
-----------------------------
SQL>select to_char(systimestamp,'yyyy-mm-dd hh24:mi:ssxff') time1,
to_char(current_timestamp) time2 from dual;
TIME1 TIME2
----------------------------- ----------------------------------------------------------------
2003-10-24 10:48:45.656000 24-OCT-03 10.48.45.656000 AM +08:00
可以看到,毫秒在to_char中对应的是FF。
SQL> select to_timestamp('2003-10-24 10:48:45.656000','yyyy-mm-dd hh24:mi:ssxff') from dual;
TO_TIMESTAMP('2003-10-2410:48:
-------------------------------------------------
24-10月-03 10.48.45.656000000 上午
22.
floor((date2-date1) /365) 作为年
floor((date2-date1, 365) /30) 作为月
mod(mod(date2-date1, 365), 30)作为日.
23.next_day函数
next_day(sysdate,6)是从当前开始下一个星期五。后面的数字是从星期日开始算起。
1 2 3 4 5 6 7
日 一 二 三 四 五 六
24.取出一个时间段中星期日星期六的天数
function weekends( p_date1 in date, p_date2 in date )
return number
as
l_date1 date default least(p_date1,p_date2);
l_date2 date default greatest(p_date1,p_date2);
l_days number default trunc(l_date2-l_date1)+1;
l_cnt number;
begin
select count(*) into l_cnt
from (select rownum r
from all_objects where rownum <= l_days)
where to_char(l_date1+r-1,'dy') in ( 'sat','sun' );
return l_cnt;
end;
Day:
dd number 12
dy abbreviated fri
day spelled out friday
ddspth spelled out, ordinal twelfth
Month:
mm number 03
mon abbreviated mar
month spelled out march
Year:
yy two digits 98
yyyy four digits 1998
24小时格式下时间范围为: 0:00:00 - 23:59:59....
12小时格式下时间范围为: 1:00:00 - 12:59:59 ....
1.
日期和字符转换函数用法(to_date,to_char)
2.
select to_char( to_date(222,'J'),'Jsp') from dual
显示Two Hundred Twenty-Two
3.
求某天是星期几
select to_char(to_date('2002-08-26','yyyy-mm-dd'),'day') from dual;
星期一
select to_char(to_date('2002-08-26','yyyy-mm-dd'),'day','NLS_DATE_LANGUAGE = American') from dual;
monday
设置日期语言
ALTER SESSION SET NLS_DATE_LANGUAGE='AMERICAN';
也可以这样
TO_DATE ('2002-08-26', 'YYYY-mm-dd', 'NLS_DATE_LANGUAGE = American')
4.
两个日期间的天数
select floor(sysdate - to_date('20020405','yyyymmdd')) from dual;
5. 时间为null的用法
select id, active_date from table1
UNION
select 1, TO_DATE(null) from dual;
注意要用TO_DATE(null)
6.
a_date between to_date('20011201','yyyymmdd') and to_date('20011231','yyyymmdd')
那么12月31号中午12点之后和12月1号的12点之前是不包含在这个范围之内的。
所以,当时间需要精确的时候,觉得to_char还是必要的
7. 日期格式冲突问题
输入的格式要看你安装的ORACLE字符集的类型, 比如: US7ASCII, date格式的类型就是: '01-Jan-01'
alter system set NLS_DATE_LANGUAGE = American
alter session set NLS_DATE_LANGUAGE = American
或者在to_date中写
select to_char(to_date('2002-08-26','yyyy-mm-dd'),'day','NLS_DATE_LANGUAGE = American') from dual;
注意我这只是举了NLS_DATE_LANGUAGE,当然还有很多,
可查看
select * from nls_session_parameters
select * from V$NLS_PARAMETERS
日期和字符转换函数用法(to_date,to_char)
We overwrite NLS_DATE_FORMAT into different formats for the session.
SQL> alter session set nls_date_format = 'DD-MON-RR'; Session altered.
SQL> set pagesize 0
SQL> set linesize 130
SQL> select * from nls_session_parameters;
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZH:TZM
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZH:TZM
NLS_DUAL_CURRENCY $
NLS_COMP BINARY
15 rows selected.
specify it in SQL statement:
SQL> select to_date('03-SEP-1999','DD-MON-YYYY') from dual;
03-SEP-99
SQL> alter session set nls_date_format = 'MM-DD-YYYY';
Session altered.
SQL> select to_date('03-SEP-99','DD-MON-YY') from dual;
TO_DATE('0
----------
09-03-1999
SQL> alter session set nls_date_format = 'RRRR-MM-DD';
Session altered.
SQL> select to_date('03-SEP-1999','DD-MON-YYYY') from dual;
TO_DATE('0
----------
1999-09-03
When we use TO_CHAR function, we get expected results of format from current SQL statement:
SQL> alter session set nls_date_format = 'MM-DD-YY';
Session altered.
SQL> select to_char(sysdate,'dd-mm-yyyy') from dual;
TO_CHAR(SYSDATE,'DD-MM-YYYY')
07-09-1999
SQL> alter session set nls_date_format = 'RR-MON-DD';
Session altered.
SQL> select to_char(sysdate,'dd-mon-yy') from dual;
TO_CHAR(SYSDATE,'DD-MON-YY')
07-sep-99
SQL> select to_char(sysdate,'dd-Mon-yy') from dual;
TO_CHAR(SYSDATE,'DD-MON-YY')
07-Sep-99
8.
select count(*)
from ( select rownum-1 rnum
from all_objects
where rownum <= to_date('2002-02-28','yyyy-mm-dd') - to_date('2002-
02-01','yyyy-mm-dd')+1
)
where to_char( to_date('2002-02-01','yyyy-mm-dd')+rnum-1, 'D' )
not
in ( '1', '7' )
查找2002-02-28至2002-02-01间除星期一和七的天数
在前后分别调用DBMS_UTILITY.GET_TIME, 让后将结果相减(得到的是1/100秒, 而不是毫秒).
9.
select months_between(to_date('01-31-1999','MM-DD-YYYY'),
to_date('12-31-1998','MM-DD-YYYY')) "MONTHS" FROM DUAL;
1
select months_between(to_date('02-01-1999','MM-DD-YYYY'),
to_date('12-31-1998','MM-DD-YYYY')) "MONTHS" FROM DUAL;
1.03225806451613
10. Next_day的用法
Next_day(date, day)
Monday-Sunday, for format code DAY
Mon-Sun, for format code DY
1-7, for format code D
11
select to_char(sysdate,'hh:mi:ss') TIME from all_objects
注意:第一条记录的TIME 与最后一行是一样的
可以建立一个函数来处理这个问题
create or replace function sys_date return date is
begin
return sysdate;
end;
select to_char(sys_date,'hh:mi:ss') from all_objects;
12.
获得小时数
SELECT EXTRACT(HOUR FROM TIMESTAMP '2001-02-16 2:38:40') from offer
SQL> select sysdate ,to_char(sysdate,'hh') from dual;
SYSDATE TO_CHAR(SYSDATE,'HH')
-------------------- ---------------------
2003-10-13 19:35:21 07
SQL> select sysdate ,to_char(sysdate,'hh24') from dual;
SYSDATE TO_CHAR(SYSDATE,'HH24')
-------------------- -----------------------
2003-10-13 19:35:21 19
获取年月日与此类似
13.
年月日的处理
select older_date,
newer_date,
years,
months,
abs(
trunc(
newer_date-
add_months( older_date,years*12+months )
)
) days
from ( select
trunc(months_between( newer_date, older_date )/12) YEARS,
mod(trunc(months_between( newer_date, older_date )),
12 ) MONTHS,
newer_date,
older_date
from ( select hiredate older_date,
add_months(hiredate,rownum)+rownum newer_date
from emp )
)
14.
处理月份天数不定的办法
select to_char(add_months(last_day(sysdate) +1, -2), 'yyyymmdd'),last_day(sysdate) from dual
16.
找出今年的天数
select add_months(trunc(sysdate,'year'), 12) - trunc(sysdate,'year') from dual
闰年的处理方法
to_char( last_day( to_date('02' || :year,'mmyyyy') ), 'dd' )
如果是28就不是闰年
17.
yyyy与rrrr的区别
'YYYY99 TO_C
------- ----
yyyy 99 0099
rrrr 99 1999
yyyy 01 0001
rrrr 01 2001
18.不同时区的处理
select to_char( NEW_TIME( sysdate, 'GMT','EST'), 'dd/mm/yyyy hh:mi:ss') ,sysdate
from dual;
19.
5秒钟一个间隔
Select TO_DATE(FLOOR(TO_CHAR(sysdate,'SSSSS')/300) * 300,'SSSSS') ,TO_CHAR(sysdate,'SSSSS')
from dual
2002-11-1 9:55:00 35786
SSSSS表示5位秒数
20.
一年的第几天
select TO_CHAR(SYSDATE,'DDD'),sysdate from dual
310 2002-11-6 10:03:51
21.计算小时,分,秒,毫秒
select
Days,
A,
TRUNC(A*24) Hours,
TRUNC(A*24*60 - 60*TRUNC(A*24)) Minutes,
TRUNC(A*24*60*60 - 60*TRUNC(A*24*60)) Seconds,
TRUNC(A*24*60*60*100 - 100*TRUNC(A*24*60*60)) mSeconds
from
(
select
trunc(sysdate) Days,
sysdate - trunc(sysdate) A
from dual
)
9i以上版本
-----------------------------
SQL>select to_char(systimestamp,'yyyy-mm-dd hh24:mi:ssxff') time1,
to_char(current_timestamp) time2 from dual;
TIME1 TIME2
----------------------------- ----------------------------------------------------------------
2003-10-24 10:48:45.656000 24-OCT-03 10.48.45.656000 AM +08:00
可以看到,毫秒在to_char中对应的是FF。
SQL> select to_timestamp('2003-10-24 10:48:45.656000','yyyy-mm-dd hh24:mi:ssxff') from dual;
TO_TIMESTAMP('2003-10-2410:48:
-------------------------------------------------
24-10月-03 10.48.45.656000000 上午
22.
floor((date2-date1) /365) 作为年
floor((date2-date1, 365) /30) 作为月
mod(mod(date2-date1, 365), 30)作为日.
23.next_day函数
next_day(sysdate,6)是从当前开始下一个星期五。后面的数字是从星期日开始算起。
1 2 3 4 5 6 7
日 一 二 三 四 五 六
24.取出一个时间段中星期日星期六的天数
function weekends( p_date1 in date, p_date2 in date )
return number
as
l_date1 date default least(p_date1,p_date2);
l_date2 date default greatest(p_date1,p_date2);
l_days number default trunc(l_date2-l_date1)+1;
l_cnt number;
begin
select count(*) into l_cnt
from (select rownum r
from all_objects where rownum <= l_days)
where to_char(l_date1+r-1,'dy') in ( 'sat','sun' );
return l_cnt;
end;




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