Question

我已经形成了一个SQL查询来检查电子邮件字段中的值是否为空，并且是否有效，所以如果假设该列中的值为空，那么它会返回正确的值，但如果该值的格式不正确，则不会返回noproperformat@format.com。因此，如果值是test@test.com.in，则该格式无效，任何人都可以帮助进行此查询。

select  Case  
    when idfEmail!='' then idfEmail 
    when (idfEmail LIKE '%_@__%.__%.__'
        AND PATINDEX('%[^a-z,0-9,@,.,_,\-]%', idfEmail) = 0) then 'noproperformat@format.com'
    else('noemailfound@noemail.com') end as idfEmail from mytable order by idfEmail Desc

当我在查询下面运行时，我会收到所有无效的电子邮件。

SELECT   idfEmail
FROM wp.APAddress
WHERE idfEmail  LIKE '%_@__%.__%.__'
AND PATINDEX('%[^a-z,0-9,@,.,_,\-]%', idfEmail) = 0

Answer 1

 select  Case  
  when (idfEmail!='' and idfEmail Not LIKE '%_@__%.__%.__' ) then idfEmail 
  when (idfEmail LIKE '%_@__%.__%.__'
        AND PATINDEX('%[^a-z,0-9,@,.,_,\-]%', idfEmail) = 0) then 'noproperformat@format.com'
  else('noemailfound@noemail.com') end as idfEmail from mytable order by idfEmail Desc

Answer 2

这是您想要的吗？

select (case when idfEmail like '%[^a-z,0-9,@,.,_,\-]%' 
             then 'noproperformat@format.com'
             when idfEmail is not null
             then idfEmail
             else 'noemailfound@noemail.com'
        end) as idfEmail
from mytable
order by idfEmail desc;

一个case表达式按顺序评估条件。您的第一个条件基本上与所有非NULL电子邮件匹配，因此返回第一个条件。

SQL Regex函数返回错误结果

2 个答案: