0
我有一個bigdate,一個smalldate,即bigdate比smalldate更大,我想通過函數實現下面的代碼。我如何將其轉換爲函數?如何創建一個函數來減去兩個日期?
NUMTODSINTERVAL (
CASE
WHEN TRUNC(datebig - datesmall) = 0
THEN datebig - datesmall
ELSE(
CASE
WHEN datebig - TRUNC (datebig) > (21/24)
THEN TRUNC (datebig) + (21/24)
ELSE datebig
END -
CASE
WHEN datesmall - TRUNC (datesmall) < (11/24)
THEN TRUNC (datesmall) + (11/24)
ELSE datesmall
End)
End , 'DAY')