SQL查询“将当前行的两列-1和前一行的第2列相加并存储在第3列中”

Question

我正在尝试编写一个 sql 查询。 在那里我输入了选择、投标和贷款的价值。 其余的一切都应该自动计算并存储在数据库中。 我无法对当前行和上一个行求和。 有人可以帮我吗？

SQL Tables:- id is AI, NOT NULL and rest all INT and NULL
    id collection bidding tender  balance loan interest cf

SQL 查询：-

START TRANSACTION;
Insert INTO chit(id, collection, bidding) VALUES (0, 500000, 225000);
UPDATE chit SET tender = collection - bidding;
UPDATE chit SET balance = bidding + cf;
UPDATE chit SET loan = 225000 ORDER BY id DESC LIMIT 1;
UPDATE chit SET interest = loan * 0.02;
UPDATE chit SET cf = interest + loan; 
COMMIT;

计算：-

balance = collection - bidding + cf (cf values should be from the previus row) 
cf = balance + interest 
interest = loan * 0.02 
tender = collection - bidding 
collection : Input 
bidding : Input 
loan : Input 

在此处输入图片说明