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Full Discussion: Checking file for duplicates
Top Forums Shell Programming and Scripting Checking file for duplicates Post 302422993 by matrixmadhan on Thursday 20th of May 2010 01:24:09 AM
Old 05-20-2010
Quote:
Originally Posted by methyl
We must assume you have a mainstream database engine which can handle CSV files and a computer which has capacity for this task. You really don't mention much about the data or the computer.

At a design level, each record must contain a unique key and whatever information is a parameter to the "purge". Unless you know the source "purge" rules your database of "data already processed" will just grow.



It would make more sense to fix the data feed design at at source. A convention is to mark the record in the source database with a unique extract run reference to prevent repeat extracts - whilst also allowing a rerun.
Unique key - this is not required, record as a whole could be unique and there is no need for unique columns in it. Worst, after applying normalization or some form of transformation, 2 records could be unique or not be so.

Fixing the problem at scope, is definitely out of question, though I agree it makes sense to do that, most of the time, its completely out of scope. Not everything flows in line. We need to work on what has been received or what could be potentially received in a real world scenario.
 

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INTLCALENDAR.SETFIRSTDAYOFWEEK(3)					 1					 INTLCALENDAR.SETFIRSTDAYOFWEEK(3)

IntlCalendar::setFirstDayOfWeek - Set the day on which the week is deemed to start

	Object oriented style

SYNOPSIS
public bool IntlCalendar::setFirstDayOfWeek (int $dayOfWeek) DESCRIPTION
Procedural style bool intlcal_set_first_day_of_week (IntlCalendar $cal, int $dayOfWeek) Defines the day of week deemed to start the week. This affects the behavior of fields that depend on the concept of week start and end such as IntlCalendar::FIELD_WEEK_OF_YEAR and IntlCalendar::FIELD_YEAR_WOY. PARAMETERS
o $cal - The IntlCalendar resource. o $dayOfWeek - One of the constants IntlCalendar::DOW_SUNDAY, IntlCalendar::DOW_MONDAY, , IntlCalendar::DOW_SATURDAY. RETURN VALUES
Returns TRUE on success. Failure can only happen due to invalid parameters. EXAMPLES
Example #1 IntlCalendar.setFirstDayOfWeek(3) <?php ini_set('date.timezone', 'Europe/Lisbon'); ini_set('intl.default_locale', 'es_ES'); $cal = IntlCalendar::createInstance(); $cal->set(2013, 5 /* June */, 30); // A Sunday var_dump($cal->getFirstDayOfWeek()); // 2 (Monday) echo IntlDateFormatter::formatObject($cal, <<<EOD week of month : 'W' week of year : 'ww EOD ), " "; $cal->setFirstDayOfWeek(IntlCalendar::DOW_SUNDAY); echo IntlDateFormatter::formatObject($cal, <<<EOD week of month : 'W' week of year : 'ww EOD ), " "; The above example will output: int(2) local day of week: 7 week of month : 4 week of year : 26 local day of week: 1 week of month : 5 week of year : 27 PHP Documentation Group INTLCALENDAR.SETFIRSTDAYOFWEEK(3)
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