如何将SQL SERVER查询转换为Oracle SQL？

我正在尝试将下面的查询从SQL Server转换为Oracle SQL。我不确定 关于甲骨文的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;

选择IIF（Grade=Min_Mark）和Marks您可以像下面这样尝试

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;

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;

选择Grade=Min\u Mark和Marks时的case您可以像下面这样尝试

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;

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;

选择case when Grade=Min\u Mark and marks您应该停止在where子句中使用那些古老的、过时的和脆弱的隐式联接，并切换到显式的
JOIN
运算符您应该停止在where子句中使用那些古老的、过时的和脆弱的隐式联接，并切换到显式的
JOIN
运算符人们一致认为第二个问题是最佳实践答案。确实非常有益。几乎每个人都同意第二个问题是最佳实践答案。确实非常有益。