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TSQL query

AXISHK
AXISHK asked
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Last Modified: 2021-04-21
Base on the TSQL below, what's the purpose of adding "MAX"  ? Can anyone think of any possible reason ? Does it mean it may return such records on PIC3, PIC2 and PIC1 and we use 'MAX' to restrict to one record ?

select inventbatchid,itemid,a2,a3,a4,
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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