我有两列,即zone和total_bill_amount,我想将以前的值与列的当前值相加。我已经使用了
select zone, total_bill_amount, sum(total_bill_amount) as Total_Bill
from Cal_Amount
where cluster_number = 'clust 2'
group by zone,total_bill_amount;
1. zone total_bill_amount Total_Bill
2. ABC 45 45
3. PQR 78 123
4. XYZ 16 139
45 = 45 45+78 = 123 123 + 16 = 139
最佳答案
您可以使用变量来做到这一点:
select zone, total_bill_amount,
@total := @total + total_bill_amount AS Total_Bill
from Cal_Amount
where cluster_number = 'clust 2'
cross join (select @total := 0) as var
order by zone
您必须用指定表中顺序的列替换 zone
,以防 zone
不是该列。
关于mysql - 将先前的值与 mysql 中的当前值相加,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35199210/