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Count (case when datepart(hh, Column ) error


Count (case when datepart(hh, Column ) error

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kabaari
kabaari
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I cannot get the following code to execute properly. Error: Msg 241, Level 16, State 1, Line 4
Conversion failed when converting datetime from character string.


select b.model,
count(case when DATEPART(hh, u.unitcompleted) = '05' then 0 end) 'Hour_1',
count(case when DATEPART(hh, u.unitcompleted) = '06' then 0 end) 'Hour_2',
count(case when DATEPART(hh, u.unitcompleted) = '07' then 0 end) 'Hour_3',
count(case when DATEPART(hh, u.unitcompleted) = '08' then 0 end) 'Hour_4',
count(case when DATEPART(hh, u.unitcompleted) = '09' then 0 end) 'Hour_5',
count(case when DATEPART(hh, u.unitcompleted) = '10' then 0 end) 'Hour_6',
count(case when DATEPART(hh, u.unitcompleted) = '11' then 0 end) 'Hour_7',
count(case when DATEPART(hh, u.unitcompleted) = '12' then 0 end) 'Hour_8',
count(case when DATEPART(hh, u.unitcompleted) = '13' then 0 end) 'Hour_9',
count(case when DATEPART(hh, u.unitcompleted) = '14' then 0 end) 'Hour_10',
count(case when DATEPART(hh, u.unitcompleted) = '15' then 0 end) 'Hour_11',
count(case when DATEPART(hh, u.unitcompleted) = '16' then 0 end) 'Hour_12',
count(case when DATEPART(hh, u.unitcompleted) = '17' then 0 end) 'Hour_13',
count(case when DATEPART(hh, u.unitcompleted) = '18' then 0 end) 'Hour_14',
count(case when DATEPART(hh, u.unitcompleted) = '19' then 0 end) 'Hour_15',
count(case when DATEPART(hh, u.unitcompleted) = '20' then 0 end) 'Hour_16',
count(case when DATEPART(hh, u.unitcompleted) = '21' then 0 end) 'Hour_17',
count(case when DATEPART(hh, u.unitcompleted) = '22' then 0 end) 'Hour_18',
count(case when DATEPART(hh, u.unitcompleted) = '23' then 0 end) 'Hour_19',
count(case when DATEPART(hh, u.unitcompleted) = '00' then 0 end) 'Hour_20'
from completedUnit u
join assignworkorder b on u.workorder = b.workorder
where MONTH( u.dateentered ) = '6' and year(u.dateentered) = '2014'
GROUP BY b.model
ORDER BY b.model




I can get this to work:



select b.model,
count(case when DATEPART(dw, u.dateentered) = '1' then 0 end) 'SUNDAY',
count(case when DATEPART(dw, u.dateentered) = '2' then 0 end) 'MONDAY',
count(case when datepart(dw, u.dateentered) = '3' then 0 end) 'TUESDAY',
count(case when datepart(dw, u.dateentered) = '4' then 0 end) 'WEDNESDAY',
count(case when datepart(dw, u.dateentered) = '5' then 0 end) 'THURSDAY',
count(case when datepart(dw, u.dateentered) = '6' then 0 end) 'FRIDAY',
count(case when DATEPART(dw, u.dateentered) = '7' then 0 end) 'SATURDAY'
from completedUnit u
join assignworkorder b on u.workorder = b.workorder
where MONTH( u.dateentered ) = '6' and year(u.dateentered) = '2014'
GROUP BY b.model
ORDER BY b.model



Sean Lange
Sean Lange
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You have a LOT of implicit casting going on here where you shouldn't be. DATEPART returns an integer, not a varchar. All of your comparisons are to a varchar. Change those to ints.

Next you have some nonSARGable predicates in your where clause. Instead of checking MONTH and YEAR you should check against dates. The way you have it will force a scan on that column as it has to check each and every row.

Try this instead.


from completedUnit u
join assignworkorder b on u.workorder = b.workorder
where u.dateentered >= '2014-06-01' and u.dateentered < '2014-07-01'
GROUP BY b.model
ORDER BY b.model



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Thanks! I worked through it resolve


select b.model,
count(case when substring(u.unitcompleted, 1,2) = '05' then 0 end) '5AM',
count(case when substring(u.unitcompleted, 1,2) = '06' then 0 end) '6AM',
count(case when substring(u.unitcompleted, 1,2) = '07' then 0 end) '7AM',
count(case when substring(u.unitcompleted, 1,2) = '08' then 0 end) '8AM',
count(case when substring(u.unitcompleted, 1,2) = '09' then 0 end) '9AM',
count(case when substring(u.unitcompleted, 1,2) = '10' then 0 end) '10AM',
count(case when substring(u.unitcompleted, 1,2) = '11' then 0 end) '11AM',
count(case when substring(u.unitcompleted, 1,2) = '12' then 0 end) '12PM',
count(case when substring(u.unitcompleted, 1,2) = '01' then 0 end) '1PM',
count(case when substring(u.unitcompleted, 1,2) = '02' then 0 end) '2PM',
count(case when substring(u.unitcompleted, 1,2) = '03' then 0 end) '3PM',
count(case when substring(u.unitcompleted, 1,2) = '04' then 0 end) '4PM'
from completedUnit u
join assignworkorder b on u.workorder = b.workorder
where MONTH( u.dateentered ) = '6' and year(u.dateentered) = '2014'
GROUP BY b.model
ORDER BY b.model




This works to get the results. I realized the data type is varchar with time as a string and not data type timestamp.
Sean Lange
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kabaari (6/10/2014)
Thanks! I worked through it resolve


select b.model,
count(case when substring(u.unitcompleted, 1,2) = '05' then 0 end) '5AM',
count(case when substring(u.unitcompleted, 1,2) = '06' then 0 end) '6AM',
count(case when substring(u.unitcompleted, 1,2) = '07' then 0 end) '7AM',
count(case when substring(u.unitcompleted, 1,2) = '08' then 0 end) '8AM',
count(case when substring(u.unitcompleted, 1,2) = '09' then 0 end) '9AM',
count(case when substring(u.unitcompleted, 1,2) = '10' then 0 end) '10AM',
count(case when substring(u.unitcompleted, 1,2) = '11' then 0 end) '11AM',
count(case when substring(u.unitcompleted, 1,2) = '12' then 0 end) '12PM',
count(case when substring(u.unitcompleted, 1,2) = '01' then 0 end) '1PM',
count(case when substring(u.unitcompleted, 1,2) = '02' then 0 end) '2PM',
count(case when substring(u.unitcompleted, 1,2) = '03' then 0 end) '3PM',
count(case when substring(u.unitcompleted, 1,2) = '04' then 0 end) '4PM'
from completedUnit u
join assignworkorder b on u.workorder = b.workorder
where MONTH( u.dateentered ) = '6' and year(u.dateentered) = '2014'
GROUP BY b.model
ORDER BY b.model




This works to get the results. I realized the data type is varchar with time as a string and not data type timestamp.


Glad you figured it out. I would highly recommend you follow my previous suggestion about your where clause. It will help the performance of your query quite a bit.

_______________________________________________________________

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Sean Lange (6/10/2014)
I would highly recommend you follow my previous suggestion about your where clause. It will help the performance of your query quite a bit.
+1
I've seen non-SARGable predicates alone make a query take several times as long as it needs to.


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kabaari
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Sean,


Thanks! I use that
WHERE

clause for static overview type queries. I will definitely take that into consideration.
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