GROUP BY同一列中的多个值

Question

我有这个SQL查询:

select prefix, code, stat, complete, COUNT(*) as Count
from table
group by prefix, code, stat, complete
order by prefix, code, stat, complete

列'前缀'是字母数字值(0-9a-zA-z).我想要的是使它如果前缀的值是一个数字,使数字等于0.如果它是一个字母,它将保持其值.我试图在group by子句下面添加以下行:

(case when prefix like '%[0-9]%' then 0 else prefix end)

但是我收到错误"将varchar值'J'转换为数据类型int时转换失败.".

导致此错误的原因是什么？如何让'prefix'列显示0或字母？

Answer 1

case when prefix like '%[0-9]%' then '0' else prefix end

你显然也需要这个作为表达式GROUP BY:

select 
    NewPrefix = case when prefix like '%[0-9]%' then '0' else prefix end, 
    code, 
    stat, 
    complete, 
    COUNT(*) as Count
from table
group by 
    case when prefix like '%[0-9]%' then '0' else prefix end, 
    code, stat, complete
order by 
    case when prefix like '%[0-9]%' then '0' else prefix end, 
    code, stat, complete