DECLARE @startDate datetime, @endDate datetime
SET @startDate = '2012-01-10 18:00:00'
SET @endDate = '2012-01-10 19:00:00'
SELECT [timestamp],
WndDir3,
SIN(RADIANS(WndDir3)) as Sin_WD,
COS(RADIANS(WndDir3)) as Cos_WD,
SIN(RADIANS(140)) as Sin_140,
COS(RADIANS(140)) as Cos_140,
RH3
FROM [eolos].[met].[MetA_1Sec]
WHERE [timestamp]>@startDate AND [timestamp]<@endDate
運行后得到
結果
想知道為什么 SIN(RADIANS(140)) 得到的結果是0.9093。這里140指的不是數字140？是位置指針或者其它標記，算的是某個單元格的值？
問題已解決，一個大神朋友瞬間指出關鍵點，浮點數
SIN(RADIANS(140))中的140要使用140.0。
SQL中參數什么類型 返回的就是什么類型
