DECODE IN SQL SERVER 2012

Dears

Please does anyone know how interpret this Oracle syntax into SQL Server?

 SUM(DECODE(t.trn_dm,'P',t.trn_qty,'B',t.trn_qty,'S',(-1)*t.trn_qty,0))
barkomeAsked:
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sdstuberCommented:
sum(case when t.trn_dm in  ('P','B') then t.trn_qty  when t.trn_dm = 'S'  then - 1 * t.trn_qty end)

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slightwv (䄆 Netminder) Commented:
DECODE is just an IF/THEN/ELSE.

convert it to CASE.

Something like:
 SUM( case t.trn_dm when 'P' then t.trn_qty when 'B' then t.trn_qty when 'S' then (-1)*t.trn_qty else 0 end)

That is Oracle syntax but I believe SQL Server is pretty much the same.
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