Sql 或关键字，当其本身在WHERE子句中时

第一篇文章在这里，但我已经是一个潜伏多年。下面是：

我有一个查询，在WHERE中有一个CASE-WHEN子句。但是，我需要在这种情况下搜索两种可能的状态

代码如下：

SELECT        
[...]

FROM            
[...]

WHERE        
(Admissions.Session = @Session) AND 

(Admissions.Remark IN 
CASE (RIGHT(@Session, 1)) 
    WHEN 1 THEN ('HY', 'HN')
    WHEN 3 THEN ('AY', 'AN')
END)

(Admissions.Remark = CASE (RIGHT(@Session, 1)) 
    WHEN 1 THEN 'HY' 
    WHEN 1 THEN 'HN' 
    WHEN 3 THEN 'AY' 
    WHEN 3 THEN 'AN' 
END)

(Admissions.Remark = CASE (RIGHT(@Session, 1)) 
    WHEN 1 THEN 'HY' OR 'HN' 
    WHEN 3 THEN 'AY' OR 'AN'
END)

基本上，我会尝试获取所有的招生行。当session参数的最后一位是“1”时，备注是“HY”或“HN”。 如果session参数以'3'结尾，那么我想获取'AY'或'an'的注释

我也尝试过这样的方法：

SELECT        
[...]

FROM            
[...]

WHERE        
(Admissions.Session = @Session) AND 

(Admissions.Remark IN 
CASE (RIGHT(@Session, 1)) 
    WHEN 1 THEN ('HY', 'HN')
    WHEN 3 THEN ('AY', 'AN')
END)

(Admissions.Remark = CASE (RIGHT(@Session, 1)) 
    WHEN 1 THEN 'HY' 
    WHEN 1 THEN 'HN' 
    WHEN 3 THEN 'AY' 
    WHEN 3 THEN 'AN' 
END)

(Admissions.Remark = CASE (RIGHT(@Session, 1)) 
    WHEN 1 THEN 'HY' OR 'HN' 
    WHEN 3 THEN 'AY' OR 'AN'
END)

……但两者都不起作用。后者只返回设置了注释“HY”的行，忽略了“HN”行

因此，我在寻找这样的东西：

SELECT        
[...]

FROM            
[...]

WHERE        
(Admissions.Session = @Session) AND 

(Admissions.Remark IN 
CASE (RIGHT(@Session, 1)) 
    WHEN 1 THEN ('HY', 'HN')
    WHEN 3 THEN ('AY', 'AN')
END)

(Admissions.Remark = CASE (RIGHT(@Session, 1)) 
    WHEN 1 THEN 'HY' 
    WHEN 1 THEN 'HN' 
    WHEN 3 THEN 'AY' 
    WHEN 3 THEN 'AN' 
END)

(Admissions.Remark = CASE (RIGHT(@Session, 1)) 
    WHEN 1 THEN 'HY' OR 'HN' 
    WHEN 3 THEN 'AY' OR 'AN'
END)

有什么建议吗？我觉得我离它很近，但缺少了一些东西。

---

谢谢

我想这就是你要找的

Admissions.Remark = CASE 
    WHEN RIGHT(@Session, 1) = 1 AND ('HY', 'HN')
    WHEN RIGHT(@Session, 1) = 3 AND ('AY', 'AN')
END

您可以使用：

SELECT ...
FROM ...
WHERE 
   (CASE WHEN Admissions.Remark IN ('HY', 'HN') THEN 1 
         WHEN Admissions.Remark IN ('AY', 'AN') THEN 3
   END) = RIGHT(@Session, 1) 

---

您也可以尝试以下语句

SELECT ...
FROM ...
WHERE 
   ((Admissions.Remark  ='HY' OR Admission.Remark = 'HN') AND  RIGHT(@Session, 1) = 1)
    OR ((Admissions.Remark ='AY'OR Admission.Remark = 'AN') AND RIGHT(@Session, 1) = 3)

---

工作！非常感谢，已经搜索了几个小时了！如果您避免使用case语句，您的查询将更快。您可以检查以获得您的愿望输出。我没有数据集来测试这个。我想这可以解决你的问题。谢谢