Question

我正在尝试将下面的查询从SQL Server转换为Oracle SQL。我不确定关于Oracle的IFF条件。

SELECT IIF(Grade<8, NULL,Name) As Name ,Grade,Marks 
FROM Grade,Students 
WHERE Marks>=Min_Mark and Marks<=Max_Mark 
ORDER BY Grade DESC, Name ASC;

Answer 1

您可以尝试以下操作

SELECT case when Grade<8 then  NULL else Name end As Name ,Grade,Marks 
FROM Grade,Students 
WHERE Marks>=Min_Mark and Marks<=Max_Mark 
ORDER BY Grade DESC, Name ASC;

但是我更喜欢像下面这样的显式联接

SELECT case when Grade<8 then  NULL else Name end As Name ,Grade,Marks 
    FROM Grade join Students 
    on  Grade.Marks>=Students.Min_Mark and
       Grade.Marks<=Students.Max_Mark 
    ORDER BY Grade DESC, Name ASC;

如何将SQL SERVER查询转换为Oracle SQL？

1 个答案: