मैं इस संग्रहीत कार्यविधि का उपयोग करने के लिए अंतराल की जरूरत उत्पन्न करने के लिए अस्थायी सारणी में time_intervals , तो JOIN और अपनी डेटा तालिका को temp time_intervals table के साथ संयोजित करें ।
प्रक्रिया आपके द्वारा निर्दिष्ट सभी विभिन्न प्रकारों के अंतराल उत्पन्न कर सकती है:
call make_intervals('2009-01-01 00:00:00','2009-01-10 00:00:00',1,'DAY')
.
select * from time_intervals
.
interval_start interval_end
------------------- -------------------
2009-01-01 00:00:00 2009-01-01 23:59:59
2009-01-02 00:00:00 2009-01-02 23:59:59
2009-01-03 00:00:00 2009-01-03 23:59:59
2009-01-04 00:00:00 2009-01-04 23:59:59
2009-01-05 00:00:00 2009-01-05 23:59:59
2009-01-06 00:00:00 2009-01-06 23:59:59
2009-01-07 00:00:00 2009-01-07 23:59:59
2009-01-08 00:00:00 2009-01-08 23:59:59
2009-01-09 00:00:00 2009-01-09 23:59:59
.
call make_intervals('2009-01-01 00:00:00','2009-01-01 02:00:00',10,'MINUTE')
.
select * from time_intervals
.
interval_start interval_end
------------------- -------------------
2009-01-01 00:00:00 2009-01-01 00:09:59
2009-01-01 00:10:00 2009-01-01 00:19:59
2009-01-01 00:20:00 2009-01-01 00:29:59
2009-01-01 00:30:00 2009-01-01 00:39:59
2009-01-01 00:40:00 2009-01-01 00:49:59
2009-01-01 00:50:00 2009-01-01 00:59:59
2009-01-01 01:00:00 2009-01-01 01:09:59
2009-01-01 01:10:00 2009-01-01 01:19:59
2009-01-01 01:20:00 2009-01-01 01:29:59
2009-01-01 01:30:00 2009-01-01 01:39:59
2009-01-01 01:40:00 2009-01-01 01:49:59
2009-01-01 01:50:00 2009-01-01 01:59:59
.
I specified an interval_start and interval_end so you can aggregate the
data timestamps with a "between interval_start and interval_end" type of JOIN.
.
Code for the proc:
.
-- drop procedure make_intervals
.
CREATE PROCEDURE make_intervals(startdate timestamp, enddate timestamp, intval integer, unitval varchar(10))
BEGIN
-- *************************************************************************
-- Procedure: make_intervals()
-- Author: Ron Savage
-- Date: 02/03/2009
--
-- Description:
-- This procedure creates a temporary table named time_intervals with the
-- interval_start and interval_end fields specifed from the startdate and
-- enddate arguments, at intervals of intval (unitval) size.
-- *************************************************************************
declare thisDate timestamp;
declare nextDate timestamp;
set thisDate = startdate;
-- *************************************************************************
-- Drop / create the temp table
-- *************************************************************************
drop temporary table if exists time_intervals;
create temporary table if not exists time_intervals
(
interval_start timestamp,
interval_end timestamp
);
-- *************************************************************************
-- Loop through the startdate adding each intval interval until enddate
-- *************************************************************************
repeat
select
case unitval
when 'MICROSECOND' then timestampadd(MICROSECOND, intval, thisDate)
when 'SECOND' then timestampadd(SECOND, intval, thisDate)
when 'MINUTE' then timestampadd(MINUTE, intval, thisDate)
when 'HOUR' then timestampadd(HOUR, intval, thisDate)
when 'DAY' then timestampadd(DAY, intval, thisDate)
when 'WEEK' then timestampadd(WEEK, intval, thisDate)
when 'MONTH' then timestampadd(MONTH, intval, thisDate)
when 'QUARTER' then timestampadd(QUARTER, intval, thisDate)
when 'YEAR' then timestampadd(YEAR, intval, thisDate)
end into nextDate;
insert into time_intervals select thisDate, timestampadd(MICROSECOND, -1, nextDate);
set thisDate = nextDate;
until thisDate >= enddate
end repeat;
END;
इस पोस्ट के निचले भाग में समान उदाहरण डेटा परिदृश्य , जहाँ मैंने SQL सर्वर के लिए एक समान फ़ंक्शन बनाया था।