Question

是否可以从IIF语句中将CAST转换为FLOAT？

SELECT TOP 100 PeopleID, RateCount, IIF (People.RateCount < 100, 
CAST(People.RateCount/100 as FLOAT), 1) as RateWeight
FROM People WHERE People.RateCount > 0 ORDER BY People.DateAdded DESC

我得到的结果是

PeopleID    RateCount   RateWeight
8548    674 1
135698  30  0
426755  2   0
336714  106 1
276739  43  0
536577  7   0
57674   81  0
79670   32  0
44674   901 1
146784  16  0

我想要的是

PeopleID    RateCount   RateWeight
8548    674 1
135698  30  .30
426755  2   .02
336714  106 1
276739  43  .43
536577  7   .07
57674   81  .81
79670   32  .32
44674   901 1
146784  16  .16

有更好的方法吗？

Answer 1

进行除法时，被除数的数据类型控制结果数据类型。要获得FLOAT或DECIMAL结果，其中一个数字必须已经是FLOAT或DECIMAL，即：

SELECT TOP 100 PeopleID, 
    RateCount, 
    IIF (People.RateCount < 100, People.RateCount/CAST(100 as FLOAT), 1) as RateWeight
FROM People 
WHERE People.RateCount > 0 
ORDER BY People.DateAdded DESC

或者，摆脱CAST，将值100设为100.0

SELECT TOP 100 PeopleID, 
    RateCount, 
    IIF (People.RateCount < 100, People.RateCount/100.0, 1) as RateWeight
FROM People 
WHERE People.RateCount > 0 
ORDER BY People.DateAdded DESC

是否可以从IIF语句中将CAST转换为FLOAT？

1 个答案: