laravel 查询生成器如何对多个特定列求和

Question

你好我有一个考生总分table

样本

我想添加 casual_wear 和 evening_gown，其中候选人 ID =1

到目前为止我得到了什么

DB::table('total_score')
->select(DB::raw('SUM(casual_wear) as total_scores'))
->where('candidate_number', '=' , '1')
->orderBy('total_scores', 'desc')
->get();

我不知道如何添加到不同的列请帮忙，提前tnx

Answer 1

I want to add the casual_wear and evening_gown where candidate ID =1

那你为什么不能像

那样对这两列进行加法呢？

select casual_wear + evening_gown as some_alias
from total_score
where candidate_ID =1;

(OR) 可能你打算做一个 SUM() GROUP BY candidate_ID 比如

select SUM(casual_wear) as total_scores,
SUM(evening_gown) as total_scores1
from total_score
GROUP BY candidate_ID
order By SUM(casual_wear) desc;

laravel 查询生成器如何对多个特定列求和

laravel query builder how to sum multiple specific columns

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