>>> from math import log, exp
>>> exp(2.0*log(5.0))
24.999999999999996
>>> 5.0*5.0
25.0

		std::vector<std::pair<std::string,type::PartitionId>> partitionInfo;
		{
			std::map< type::PartitionId, std::string > niceTraces;

			query::Partitions query;
			partitionInfo = query.execute( );

			for( const auto &item : partitionInfo ) {
				auto &text = niceTraces[item.second];

				if( !text.empty( ) ) {
					text += ", ";
				}

				text += item.first;
			}

			LOG_INFO( ) << "Obtained partitions and their devices:";
			for( const auto &info : niceTraces ) {
				LOG_INFO( ) << std::setfill( '0' ) << std::setw( 3 ) << info.first << ": [ " << info.second << " ]";

/* __ieee754_pow(x,y) return x**y
 *
 *		      n
 * Method:  Let x =  2   * (1+f)
 *	1. Compute and return log2(x) in two pieces:
 *		log2(x) = w1 + w2,
 *	   where w1 has 53-24 = 29 bit trailing zeros.
 *	2. Perform y*log2(x) = n+y' by simulating muti-precision
 *	   arithmetic, where |y'|<=0.5.
 *	3. Return x**y = 2**n*exp(y'*log2)
 *
 * Special cases:
 *	1.  (anything) ** 0  is 1
 *	2.  (anything) ** 1  is itself
 *	3.  (anything) ** NAN is NAN
 *	4.  NAN ** (anything except 0) is NAN
 *	5.  +-(|x| > 1) **  +INF is +INF

#ifdef __STDC__
	double __ieee754_pow(double x, double y)
#else
	double __ieee754_pow(x,y)
	double x, y;
#endif

     So you can, technically, set a :before pseudo class for :visited links, but it will be ignored and appears as if the links are not visited. This is not a bug, it's a feature ;)

Cod_prod  Mes	Año		PVD_PVDU	PVD_PVDU
    00277     09	2021	100			100
    00277     08	2021	100			100
    00277     07	2021	100			100
    00282     09	2021	100			100
    00282     08	2021	100			100
    00282     07	2021	100			100

Tengo esto pero no me sirve; quiro refactorisar el query para que sea uno solo:

SELECT PVD_Year PVD_Month, PVD_PVDU, PVD_PVDP, PVD_Prod_Code FROM VEN_TempPVD WHERE PVD_Year='" . $año . "' AND PVD_Prod_Code='" . $codpro . "' AND PVD_Month=" . $mes . " ORDER BY PVD_Month ASC;

$months=[
	1=>'',
	2=>'',
	3=>'',
];

foreach ($months as $key => $data){
	unset($months[$key]);
	$cp_month = date("Y-m", strtotime ('-'.$key.' month',strtotime($date)));
	$months[$cp_month] = 0;
}