MySQL Trigger不会工作，但类似的

Question

这是一个MySQL触发器

IF ... THEN
#User Lost
UPDATE users SET h2h_money = h2h_money - ( SELECT entry FROM contests WHERE contestid = new . contestid ) WHERE username = new . username;
#User Won
UPDATE users SET h2h_money = h2h_money + new . prize WHERE username = new . username;
#Money Entered
UPDATE users SET h2h_money_entered = h2h_money_entered + ( SELECT entry FROM contests WHERE contestid = new . contestid ) WHERE username = new . username;

#Money输入下的查询有效，但#User Lost不起作用。它不会从用户赢得的总金额中扣除入场费。如果它有所不同，则h2h_money的默认值为0.

如果重要的话，字段类型是小数。