Sql 在where子句中将case语句转换为逻辑运算符

你能帮我把这段代码转换成逻辑运算符并使用

'like'

而不是

'='

吗？因为我知道把case语句放在where子句上是没有效率的。蒂亚！这是密码

Where
(@reftype = '0' or
  (@refnum = case @reftype when 'BN' then refBN when 'C' then refC when 'O' then refO else 'n/a' end)
)

替换

or @refnum = case @reftype when 'BN' then refBN when 'C' then refC when 'O' then refO else 'n/a' end)

与

---

您可以通过以下方式将其转换为布尔逻辑：

WHERE  @reftype = '0 'OR @refnum = 'n/a' 
OR (@reftype = 'BN' AND @refnum = refbn)
OR (@reftype = 'C'  AND @refnum = refc)
OR (@reftype = 'O'  AND @refnum = refo)

---

但是请注意，

WHERE

-子句中的

CASE

本身并不低效。

感谢您编辑Tim。我确实翻译了，但我的上司说它错了。这是我的代码：其中（@reftype='0'或（@reftype='BN'和refBN像@refnum）或（@reftype='C'和refC像@refnum）或（@reftype='O'和refO像@refnum）或（@reftype='n/a'）我不知道我遗漏了什么。谢谢蒂姆。看起来也是我翻译的。我不知道为什么我的上司对此不高兴。

WHERE  @reftype = '0 'OR @refnum = 'n/a' 
OR (@reftype = 'BN' AND @refnum = refbn)
OR (@reftype = 'C'  AND @refnum = refc)
OR (@reftype = 'O'  AND @refnum = refo)