SQL 使用子查询的条件创建列

Question

我有一个 table，带有 ID 和高度、长度和宽度。我需要找到每一行的 mas 度量，然后如果最大度量在 22 和 30 之间，则创建一列附加费 $5，如果大于 30，则创建 8。第一部分工作正常

select id, max(measure) as max_measure
from (
        select id, height as measure from table1 
        union
        select id, length as measure from table1 
        union
        select id, width as measure from table1 
     ) m
group by id

但是我不能做第二部分，它应该是一个子查询，使用我从第一部分得到的结果，看起来大致像这样

select surcharge where 
        m.max_measure >= 22 and m.max_measure <30 
        m.max_measure>= 30

Answer 1

select id, 
       max(measure) as max_measure,
       case when max(measure) >= 30 then 8
            when max(measure) >= 22 then 5
            else 0 end as surcharge

SQL 使用子查询的条件创建列

SQL Create a column with conditions from a sub query

sql

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