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MAX function
suppose the records in a table containing the records below :
inventbatchid itemid a2 a3 a4 PIC3
PO10901 AB0001 A DX 20 c:\photo\abc135.jpg
PO10901 AB0001 A DX 20 c:\photo\abc13512321321.jp
PO10901 AB0001 A DX 20 c:\photo\ac135.jpg
In this case, which record will be returned by "MAX" function ? Tks
select inventbatchid,itemid,a2,a3
Tent,
max(case typeid when 'ImgS' then pic else '' end) as 'PIC3',
max(case typeid when 'sketchA' then pic else '' end) as 'PIC2',
max(case typeid when 'sketchB' then pic else '' end) as 'PIC1'
into #tmp3 from #tmp2
inventbatchid itemid a2 a3 a4 PIC3
PO10901 AB0001 A DX 20 c:\photo\abc135.jpg
PO10901 AB0001 A DX 20 c:\photo\abc13512321321.jp
PO10901 AB0001 A DX 20 c:\photo\ac135.jpg
In this case, which record will be returned by "MAX" function ? Tks
select inventbatchid,itemid,a2,a3
Tent,
max(case typeid when 'ImgS' then pic else '' end) as 'PIC3',
max(case typeid when 'sketchA' then pic else '' end) as 'PIC2',
max(case typeid when 'sketchB' then pic else '' end) as 'PIC1'
into #tmp3 from #tmp2
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The same as text sorting. The c after a is the "biggest" in that location of the 3 strings, so that makes this the maximum
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Presumably you'd want each max based on a specific inventbatchid, something like this:
select t2.inventbatchid,t2.itemid
t2_pics.PIC3,t2_pics.PIC2,
into #tmp3
from #tmp2 t2
inner join (
select inventbatchid,
max(case typeid when 'ImgS' then pic else '' end) as 'PIC3',
max(case typeid when 'sketchA' then pic else '' end) as 'PIC2',
max(case typeid when 'sketchB' then pic else '' end) as 'PIC1'
from #tmp2
group by inventbatchid
) AS t2_pics on
t2_pics.inventbatchid = t2.inventbatchid
select t2.inventbatchid,t2.itemid
t2_pics.PIC3,t2_pics.PIC2,
into #tmp3
from #tmp2 t2
inner join (
select inventbatchid,
max(case typeid when 'ImgS' then pic else '' end) as 'PIC3',
max(case typeid when 'sketchA' then pic else '' end) as 'PIC2',
max(case typeid when 'sketchB' then pic else '' end) as 'PIC1'
from #tmp2
group by inventbatchid
) AS t2_pics on
t2_pics.inventbatchid = t2.inventbatchid
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Microsoft SQL Server 2008
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ie. the case expressions require a value in the field typeid, that value is not provided in your data