SQL-Fehler in Casting

Question

Ich versuche, Datums- und Zeitfelder, um den aktuellen Status zu einem bestimmten Zeitpunkt mit dem folgenden Code zu wählen ...

select max(CONVERT(DATETIME, S.Start_date, 108) 
    + ISNULL(STUFF(case when len(S.start_time) < 4 then '0' + S.start_time else S.start_time end,3,0,':'),'23:59') as LATST 
     , computer_number 
     , event_key 
     , exam_key 
    from CRIS_status S 
     where cast(Start_date as datetime) <= '17 Jul 2016 23:59:59' 
    group by computer_number, event_key, exam_key 

und ich bekomme die folgenden Fehler messgae beitreten Msg 242, Ebene 16, Status 3, Zeile 1 ...

Answer 1

Du bist gerade Datetime mit einem Varchar die wahrscheinlich Fehler

Versuchen mit diesem gibt ...

select max(CONVERT(DATETIME, S.Start_date, 108) 
    + ISNULL(STUFF(case when len(S.start_time) < 4 then '0' + S.start_time else S.start_time end,3,0,':'),'23:59') as LATST 
     , computer_number 
     , event_key 
     , exam_key 
    from CRIS_status S 
     where cast(Start_date as datetime) <= cast('17 Jul 2016 23:59:59' as datetime) 
    group by computer_number, event_key, exam_key 

Answer 2

Verwenden Sie stets eindeutige Datumsformat

select max(CONVERT(DATETIME, S.Start_date, 108) 
    + ISNULL(STUFF(case when len(S.start_time) < 4 then '0' + S.start_time else S.start_time end,3,0,':') 
,'23:59') as LATST 
     , computer_number 
     , event_key 
     , exam_key 
    from CRIS_status S 
     where cast(Start_date as datetime) < '20160718' 
    group by computer_number, event_key, exam_key