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Developer-C 11.1
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create table t (ItemID varchar(5), Assortment int, UnitID varchar(5)); create table pb (ItemID varchar(5), Assortment int, UnitID varchar(5), Price decimal(5,2)); insert into t select 'A01', 1, 'ea' union all select 'A02', 1, 'kg' union all select 'A03', 2, 'pc'; insert into pb select 'A01', 1, 'ea', 1.5 union all select 'A02', 1, 'pc', 2.5 union all select 'A03', 2, 'kg', 5 union all select 'A03', 2, 'pc', 1;
7 rows affected
select t.ItemID, t.UnitID, pb.Price from t outer apply ( select price, UnitID, Row_Number() over(order by case when pb.UnitID=t.UnitID then 1 end desc)pri from pb where pb.ItemID=t.ItemID and pb.Assortment=t.Assortment )pb where pb.pri=1
ItemID
UnitID
Price
A01
ea
1.50
A02
kg
2.50
A03
pc
1.00