if not exists
(
select null
from sys.objects
where type_Desc = N’CHECK_CONSTRAINT’
and object_name(parent_object_id) = N’Product’
and object_name(object_id) = N’CK_Product_Constraint’
)
begin
alter table Product
add constraint CK_Product_Constraint check (not(ByInstance = 1 and stock_avail_id <> 1))
end
go
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