我不是很擅长SQL，所以我一直试图通过PHP处理这个并进行非常基本的mySQL查询，但显然我的内存不足（在PHP中）因为我处理了很多数据（以及大量可怕的嵌套foreach）。我希望可能有一种方法可以重新编写我的SQL，以免发生这种情况。
这是我正在处理的表格（仅显示相关字段）：
组织
FundingCycles
AdministrativeRequests
CapitalRequests
EventRequests
所以，这是复杂的部分。我需要为AmountRequested，AmountFunded的每个组织创建总和（这两个似乎很容易，但不确定跨多个表的求和），以及来自请求的计算字段AmountAfterCutback在所有请求表中（AdministrativeRequests，CapitalRequests，EventRequests）。
AmountAfterCutback等于：AmountFunded - (AmountFunded * Cutback）。
如果削减只是一个值，这可能很简单。但是，Cutback来自FundingCycles表。所以我不能直接求和并应用削减，我必须找出每个请求的削减，并且为此我必须查看每个请求，然后通过其CycleID检查，看看是什么该请求的削减在FundingCycles表中。
默认情况下，Cutback等于NonUnityCutBack。但是，如果请求是Unity请求（仅EventRequests，UnityReq == 1），则削减等于UnityCutBack。然而，它变得更具挑战性，因为削减可以单独应用于每个请求，覆盖统一或不一致的削减（如果PerOff is > 0）。
所以，不知何故，我必须总结一个组织所做的每一个请求，并正确计算上面提到的字段。我将在下面展示我的解决方案，我将警告它肯定不是很漂亮，并且在这一点上甚至没有功能，因为它在尝试通过PHP处理它时耗尽了内存。我知道有更好的方法来做到这一点。有些方法可以对每个请求进行条件计算，这样可以在查询中求和，而不是我下面笨重的PHP解决方案？有任何想法吗？感谢任何有耐心甚至读到这一点的人，我知道这是一个问题的PITA。非常感谢任何帮助！
function calculate_public_records()
{
$total_req_total = 0;
$total_funded_total = 0;
$total_cutback_total = 0;
$organizations = array();
foreach($this->organizations as $org)
{
$id = $org['OrgID'];
$org_req_total = 0;
$org_funded_total = 0;
$org_cutback_total = 0;
$cycles = array();
foreach($this->cycles as $cycle)
{
$cycle_req_total = 0;
$cycle_funded_total = 0;
$cycle_cutback_total = 0;
$cycle_requests = array();
foreach($this->request_types as $type)
{
$reqs = $this->funding_request_model->getRequests($type, $cycle['CycleID'], $id);
foreach($reqs as $r)
{
$cutback = $cycle['NonUnityCutBack'];
if ($type == "Event") $cutback = ($r->UnityReq == 1) ? $cycle['UnityCutBack'] : $cutback;
$cutback = ($r->PerOff != 0) ? $r->PerOff : $cutback;
$request = array();
$request['id'] = $r->ReqID;
$request['type'] = $type;
$request['name'] = $r->Title;
$request['requested'] = number_format($r->RequestTotal, 2);
$request['funded'] = number_format($r->AmtFunded, 2);
$request['cutback'] = number_format(($r->AmtFunded - ($r->AmtFunded * $cutback)), 2);
$cycle_req_total += $request['requested'];
$cycle_funded_total += $request['funded'];
$cycle_cutback_total += $request['cutback'];
$cycle_requests[] = $request;
}
}
$cycle_totals = array();
$cycle_totals['requested'] = number_format($cycle_req_total, 2);
$cycle_totals['funded'] = number_format($cycle_funded_total, 2);
$cycle_totals['cutback'] = number_format($cycle_cutback_total, 2);
$org_req_total += $cycle_req_total;
$org_funded_total += $cycle_funded_total;
$org_cutback_total += $cycle_cutback_total;
$cycles[] = array('name' => $cycle['CycleName'], 'requests' => $cycle_requests, 'totals' => $cycle_totals);
}
$org_totals = array();
$org_totals['requested'] = number_format($org_req_total, 2);
$org_totals['funded'] = number_format($org_funded_total, 2);
$org_totals['cutback'] = number_format($org_cutback_total, 2);
$total_req_total += $org_req_total;
$total_funded_total += $org_funded_total;
$total_cutback_total += $org_cutback_total;
$organizations[] = array('id' => $org['OrgID'], 'name' => $org['Organization'], 'cycles' => $cycles, 'totals' => $org_totals);
}
$totals = array();
$totals['requested'] = number_format($total_req_total, 2);
$totals['funded'] = number_format($total_funded_total, 2);
$totals['cutback'] = number_format($total_cutback_total, 2);
return array('organizations' => $organizations, 'totals' => $totals);
计算摘要：
# For tables AdministrativeRequests, CapitalRequests & EventRequests, calculate:
SUM(AmountRequested)
SUM(AmountFunded)
# For tables AdministrativeRequests, CapitalRequests & EventRequests, calculate:
AmountAfterCutback = AmountFunded - (AmountFunded * Cutback)
# Cutback calculation pseudocode
if( <table>.PerOff > 0 ) {
Cutback = <table>.PerOff
} elseif ( <table> == EventRequests && EventRequests.UnityReq == 1 ) {
Cutback = FundingCycles.UnityCutBack
} else {
Cutback = FundingCycles.NonUnityCutBack
}
答案 0 :(得分：2)
学习SQL。快速阅读表明答案可能是......
SELECT orgid
, SUM(requested) AS amountrequested
, SUM(funded) AS amountfunded
, SUM(IF(unityreq=1, unitycutback, nonunitycutback) * funded)
AS amountaftercutback
FROM
(
SELECT cycleid, orgid, unityreq,
SUM(amountrequested) as requested, SUM(amountfunded) as funded
FROM
(
(
SELECT cycleid, orgid, AmountRequested, AmountFunded, 0 as unityreq
FROM administrativerequests
)
UNION
(
SELECT cycleid, orgid, AmountRequested, AmountFunded, 0 as unityreq
FROM capitalrequests
)
UNION
(
SELECT cycleid, orgid, AmountRequested, AmountFunded, unityreq
FROM eventrequests
)
) ilv
GROUP BY cycleid, orgid, unityreq
) ilv,
fundingcycles fc
WHERE fc.cycleid=ilv.cycleid
GROUP BY orgid
答案 1 :(得分：2)
以下是我的尝试 - 已更新为使用UNION ALL代替UNION：
SELECT OrgID,
SUM(AmountRequested),
SUM(AmountFunded),
SUM(AmountFunded - (
AmountFunded *
IF( PerOff > 0,
PerOff,
IF( UnityReq = 1,
UnityCutBackAmount,
NonUnityCutBackAmount
)
)
)) AS AmountAfterCutback
FROM (
SELECT o.OrgID,
ar.AmountRequested,
ar.AmountFunded,
ar.PerOff,
null AS UnityReq,
fc_ar.CycleID,
fc_ar.NonUnityCutBackAmount,
fc_ar.UnityCutBackAmount
FROM Organizations o
JOIN AdministrativeRequests ar
ON ar.OrgID = o.OrgID
JOIN FundingCycles fc_ar
ON fc_ar.CycleID = ar.CycleID
UNION ALL
SELECT o.OrgID,
cr.AmountRequested,
cr.AmountFunded,
cr.PerOff,
null AS UnityReq,
fc_cr.CycleID,
fc_cr.NonUnityCutBackAmount,
fc_cr.UnityCutBackAmount
FROM Organizations o
JOIN CapitalRequests cr
ON cr.OrgID = o.OrgID
JOIN FundingCycles fc_cr
ON fc_cr.CycleID = cr.CycleID
UNION ALL
SELECT o.OrgID,
er.AmountRequested,
er.AmountFunded,
er.PerOff,
er.UnityReq,
fc_er.CycleID,
fc_er.NonUnityCutBackAmount,
fc_er.UnityCutBackAmount
FROM Organizations o
JOIN EventRequests er
ON er.OrgID = o.OrgID
JOIN FundingCycles fc_er
ON fc_er.CycleID = er.CycleID
) tmp
GROUP BY OrgID;