我有表test1并且有一个列DOJ，其时间戳数据类型的记录很少，如下所示。 在这里，我需要doj和systimestamp之间的差异im毫秒。
SELECT DOJ FROM TEST1;
DOJ
----------------------------
21-MAR-14 09.25.34.514526000
21-MAR-14 09.25.34.520345000
22-MAR-14 09.25.34.523144000
22-MAR-14 09.25.34.527770000
23-MAR-14 09.25.34.532482000
23-MAR-14 09.25.34.535603000
24-MAR-14 09.25.34.538556000
24-MAR-14 09.25.34.541729000
SELECT SYSTIMESTAMP FROM DUAL;
SYSTIMESTAMP
--------------
24-MAR-14 09.48.10.251556000 +00:00
有人可以帮助我。
答案 0 :(得分：19)
扩展René的答案，如果你想要总毫秒数，那么你需要提取并组合通过从另一个时间戳中减去一个时间戳产生的间隔中的所有元素：
select doj, systimestamp - doj,
trunc(1000 * (extract(second from systimestamp - doj)
+ 60 * (extract(minute from systimestamp - doj)
+ 60 * (extract(hour from systimestamp - doj)
+ 24 * (extract(day from systimestamp - doj) ))))) as milliseconds
from test1;
DOJ SYSTIMESTAMP-DOJ MILLISECONDS
---------------------------- ---------------- ----------------
21-MAR-14 09.25.34.514526000 3 2:9:8.785713 266948785
21-MAR-14 09.25.34.520345000 3 2:9:8.779894 266948779
22-MAR-14 09.25.34.523144000 2 2:9:8.777095 180548777
22-MAR-14 09.25.34.527770000 2 2:9:8.772469 180548772
23-MAR-14 09.25.34.532482000 1 2:9:8.767757 94148767
23-MAR-14 09.25.34.535603000 1 2:9:8.764636 94148764
24-MAR-14 09.25.34.538556000 0 2:9:8.761683 7748761
24-MAR-14 09.25.34.541729000 0 2:9:8.75851 7748758
SQL Fiddle，包括用于比较的Unix纪元日期，但您需要针对服务器时区进行调整。
答案 1 :(得分：4)
select
extract(second from systimestamp - doj) * 1000
from
test1;
答案 2 :(得分：0)
如果你需要handle leap seconds，那么你可以创建一个实用程序包来调整纪元时间以解决这个问题：
CREATE OR REPLACE PACKAGE time_utils
IS
FUNCTION milliseconds_since_epoch(
in_datetime IN TIMESTAMP,
in_epoch IN TIMESTAMP DEFAULT TIMESTAMP '1970-01-01 00:00:00'
) RETURN NUMBER;
FUNCTION milliseconds_epoch_to_ts (
in_milliseconds IN NUMBER,
in_epoch IN TIMESTAMP DEFAULT TIMESTAMP '1970-01-01 00:00:00'
) RETURN TIMESTAMP;
END;
/
SHOW ERRORS;
CREATE OR REPLACE PACKAGE BODY time_utils
IS
-- List of the seconds immediately following leap seconds:
leap_seconds CONSTANT SYS.ODCIDATELIST := SYS.ODCIDATELIST(
DATE '1972-07-01',
DATE '1973-01-01',
DATE '1974-01-01',
DATE '1975-01-01',
DATE '1976-01-01',
DATE '1977-01-01',
DATE '1978-01-01',
DATE '1979-01-01',
DATE '1980-01-01',
DATE '1981-07-01',
DATE '1982-07-01',
DATE '1983-07-01',
DATE '1985-07-01',
DATE '1988-01-01',
DATE '1990-01-01',
DATE '1991-01-01',
DATE '1992-07-01',
DATE '1993-07-01',
DATE '1994-07-01',
DATE '1996-01-01',
DATE '1997-07-01',
DATE '1999-01-01',
DATE '2006-01-01',
DATE '2009-01-01',
DATE '2012-07-01',
DATE '2015-07-01',
DATE '2016-01-01'
);
HOURS_PER_DAY CONSTANT BINARY_INTEGER := 24;
MINUTES_PER_HOUR CONSTANT BINARY_INTEGER := 60;
SECONDS_PER_MINUTE CONSTANT BINARY_INTEGER := 60;
MILLISECONDS_PER_SECOND CONSTANT BINARY_INTEGER := 1000;
MINUTES_PER_DAY CONSTANT BINARY_INTEGER := HOURS_PER_DAY * MINUTES_PER_HOUR;
SECONDS_PER_DAY CONSTANT BINARY_INTEGER := MINUTES_PER_DAY * SECONDS_PER_MINUTE;
MILLISECONDS_PER_MINUTE CONSTANT BINARY_INTEGER := SECONDS_PER_MINUTE * MILLISECONDS_PER_SECOND;
MILLISECONDS_PER_HOUR CONSTANT BINARY_INTEGER := MINUTES_PER_HOUR * MILLISECONDS_PER_MINUTE;
MILLISECONDS_PER_DAY CONSTANT BINARY_INTEGER := HOURS_PER_DAY * MILLISECONDS_PER_HOUR;
FUNCTION milliseconds_since_epoch(
in_datetime IN TIMESTAMP,
in_epoch IN TIMESTAMP DEFAULT TIMESTAMP '1970-01-01 00:00:00'
) RETURN NUMBER
IS
p_leap_milliseconds BINARY_INTEGER := 0;
p_diff INTERVAL DAY(9) TO SECOND(3);
BEGIN
IF in_datetime IS NULL OR in_epoch IS NULL THEN
RETURN NULL;
END IF;
p_diff := in_datetime - in_epoch;
IF in_datetime >= in_epoch THEN
FOR i IN 1 .. leap_seconds.COUNT LOOP
EXIT WHEN in_datetime < leap_seconds(i);
IF in_epoch < leap_seconds(i) THEN
p_leap_milliseconds := p_leap_milliseconds + MILLISECONDS_PER_SECOND;
END IF;
END LOOP;
ELSE
FOR i IN REVERSE 1 .. leap_seconds.COUNT LOOP
EXIT WHEN in_datetime > leap_seconds(i);
IF in_epoch > leap_seconds(i) THEN
p_leap_milliseconds := p_leap_milliseconds - MILLISECONDS_PER_SECOND;
END IF;
END LOOP;
END IF;
RETURN MILLISECONDS_PER_SECOND * EXTRACT( SECOND FROM p_diff )
+ MILLISECONDS_PER_MINUTE * EXTRACT( MINUTE FROM p_diff )
+ MILLISECONDS_PER_HOUR * EXTRACT( HOUR FROM p_diff )
+ MILLISECONDS_PER_DAY * EXTRACT( DAY FROM p_diff )
+ p_leap_milliseconds;
END milliseconds_since_epoch;
FUNCTION milliseconds_epoch_to_ts(
in_milliseconds IN NUMBER,
in_epoch IN TIMESTAMP DEFAULT TIMESTAMP '1970-01-01 00:00:00'
) RETURN TIMESTAMP
IS
p_datetime TIMESTAMP;
BEGIN
IF in_milliseconds IS NULL OR in_epoch IS NULL THEN
RETURN NULL;
END IF;
p_datetime := in_epoch
+ NUMTODSINTERVAL( in_milliseconds / MILLISECONDS_PER_SECOND, 'SECOND' );
IF p_datetime >= in_epoch THEN
FOR i IN 1 .. leap_seconds.COUNT LOOP
EXIT WHEN p_datetime < leap_seconds(i);
IF in_epoch < leap_seconds(i) THEN
p_datetime := p_datetime - INTERVAL '1' SECOND;
END IF;
END LOOP;
ELSE
FOR i IN REVERSE 1 .. leap_seconds.COUNT LOOP
EXIT WHEN p_datetime > leap_seconds(i);
IF in_epoch > leap_seconds(i) THEN
p_datetime := p_datetime + INTERVAL '1' SECOND;
END IF;
END LOOP;
END IF;
RETURN p_datetime;
END milliseconds_epoch_to_ts;
END;
/
SHOW ERRORS;
然后你可以这样做：
SELECT TIME_UTILS.MILLISECONDS_SINCE_EPOCH(
in_datetime => TIMESTAMP '1974-01-01 00:00:00.000',
in_epoch => TIMESTAMP '1973-12-31 23:59:59.999'
) AS diff
FROM DUAL;
获得输出：
DIFF
----
1001
注意：在提出新的闰秒时，您需要使软件包保持最新状态。