我们正在开发一个广告平台并编写一个负责投放广告的大查询，向消费者投放广告有几个标准，其中一个标准是广告系列每日预算，所以我们正在做的是分组by Individual Ads 以获取展示次数和消耗的成本，然后我们按 Campaign 分组，产生以下查询：
(from a in AdCreative
join h in AdHit on a.ID equals h.AdID into gh
join l in AdGroup_Location on a.AdGroupID equals l.AdGroupID into gj
from subloc in gj.DefaultIfEmpty()
from subhits in gh.DefaultIfEmpty()
where a.AdDimensionID == 7 &&
(subloc == null || subloc.LocationID == 23)
select new {
ID = a.ID,
Name = a.Name,
Spent = (subhits.AdDimension != null) ? ((double)subhits.AdDimension.Credit / 1000 ) : 0,
CampaignID = a.AdGroup.Campaign.ID,
CampaignName = a.AdGroup.Campaign.Name,
CampaignBudget = a.AdGroup.Campaign.DailyBudget
})
.GroupBy(adgroup => adgroup.ID)
.Select(adgroup => new {
ID = adgroup.Key,
Name = adgroup.FirstOrDefault().Name,
Spent = adgroup.Sum(q => q.Spent),
CampaignID = adgroup.FirstOrDefault().CampaignID,
CampaignName = adgroup.FirstOrDefault().CampaignName,
CampaignBudget = adgroup.FirstOrDefault().CampaignBudget,
})
.GroupBy(q => q.CampaignID)
.Select(campaigngroup => new {
CampaignID = campaigngroup.Key,
DailyBudget = campaigngroup.FirstOrDefault().CampaignBudget,
Spent = campaigngroup.Sum(q => q.Spent),
Ads = campaigngroup.GroupBy(q => q.ID).Select(adgroup => new {
ID = adgroup.Key,
Name = adgroup.FirstOrDefault().Name,
Spent = adgroup.FirstOrDefault().Spent
})
})
正如您在屏幕截图的结果中看到的那样，它运行良好，但是当我检查生成 SQL 查询时，我得到了402行 SQL 代码。怎么可能？我能做些什么来增强代码吗