create table #warehouse(item sysname, feature nvarchar(100))
create table #fruit(fname sysname, color sysname)
insert #fruit select 'apple', 'green'
insert #fruit select 'melon', 'lime'
insert #fruit select 'orange', 'orange'
insert #fruit select 'grape', 'purple'
insert #warehouse(item) select fname from #fruit
-- update 1
update a
set a.feature = 'color = ' + b.color
from #warehouse a join #fruit b on a.item = b.fname
select * from #warehouse
-- update 2
update #warehouse set feature = 'new feature = ' + (select top 1 color from #fruit b where #warehouse.item = b.fname)
select * from #warehouse
drop table #warehouse, #fruit