Convert string to datetime and then use in a where clause

Question

I am trying to pull in warranty expiry dates that have been entered as strings and then perform a calculation as to which ones are expired, about to expire within
90 days or will expire in more than 90 days. I have got the query to a point where I have converted it to a datetime field (though I'm sure I used the right value to just give me the date, its giving me date and time) and have it printing out the machine name
and the warranty for that machine.
SELECT
  machNameTab.machName
  ,convert(date,auditRsltManualFieldValues.fieldValue,103) AS warranty
FROM
  machNameTab
  INNER JOIN auditRsltManualFieldValues
    ON machNameTab.agentGuid = auditRsltManualFieldValues.agentGuid
WHERE
  machNameTab.groupName = N'root.company'
  AND auditRsltManualFieldValues.fieldNameFK = 958472722796011
What I need to do next is change this so instead of just spitting out all the dates as 'Warranty', I want it to give me the fields 'Expired', 'Expiring' (expiry date is within 90 days of the current date) and 90Days (expiry date is over 90 days from the current
date)

Answer 1

SELECT
machNameTab.machName
,convert(date,auditRsltManualFieldValues.fieldValue,103) AS warranty,
select
case
when datediff(day,getdate(),convert(date,auditRsltManualFieldValues.fieldValue,103) )<90 then 'Expiring'
when datediff(day,getdate(),convert(date,auditRsltManualFieldValues.fieldValue,103) )<0 then 'Expired'
when datediff(day,getdate(),convert(date,auditRsltManualFieldValues.fieldValue,103) )>=90 then '90Days'
end as status
FROM
machNameTab
INNER JOIN auditRsltManualFieldValues
ON machNameTab.agentGuid = auditRsltManualFieldValues.agentGuid
WHERE
machNameTab.groupName = N'root.company'
AND auditRsltManualFieldValues.fieldNameFK = 958472722796011
I added a case to your select. The case will output the strings you wanted based on the date.