case 子句中的复合条件

Question

对于一个给定的例子，我怎么写，

select attendee, begindate
case evaluation
    when 1 then 'bad'
    when 2 then 'mediocre'
    when 3 then 'ok'
    when 4 then 'good'
    when 5 then 'excellent'
    else 'not filled in'
end
from registrations
where course = 'S02'

复合条件，如when 1 [and] something else 'then' 值。

应该使用什么运算符来代替 [and]？

谢谢！

Answer 1

建议您稍微不同地构建您的案例：

case
    when evaluation in (1,2) then 'bad'
    when evaluation = 3 then 'ok'
    when evaluation = 4 then 'good'
    when evaluation = 5 then 'excellent'
    else 'not filled in'
end