函數傳回在往績中某一場目標賽事距離現賽多少日。
語法
HrDaysAgo(nBackRaces,'fCondition',nDefaultVal)
JrDaysAgo(nBackRaces,'fCondition',nDefaultVal)
SrDaysAgo(nBackRaces,'fCondition',nDefaultVal)
回傳值
Numeric
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