如何修改此 sql 以执行？

Question

创建表钱包(userId int , coin int, 主键(userId));

更新钱包 SET coin=coin-(least(select coin FROM wallet where userId=101,500)) where userId=101;

Answer 1

一个

update wallet 
SET coin=coin-(least(coin,500)) 
where userId=101;

或者其他的可能

update wallet 
SET coin=case when coin < 500 then 0 else coin-500 end
where userId=101;