很急的问题!请各位大哥帮忙!
在sum()中要实现四列像加,sum()中的代码如下,但报错
sum("INSURANCE"."MEDICAL_PAYMENT_MASTER"."PAY_FROM_FUND" + "INSURANCE"."MEDICAL_PAYMENT_MASTER"."PAY_FROM_HELP" + "INSURANCE"."MEDICAL_PAYMENT_MASTER"."PAY_OTHER_FEE" + "INSURANCE"."MEDICAL_PAYMENT_MASTER"."PAY_FROM_SUPPLY")
请问各位应该如何写,里面的字段都是NUMBER(12,2)