upsert with addition

Question

如何在Microsoft SQL Server 2008中编写以下内容？

IF EXISTS(SELECT * FROM Table WHERE Something=1000) 
UPDATE Table SET Qty = Qty + 1 WHERE Something=1000 
ELSE 
INSERT INTO Table(Something,Qty) VALUES(1000,1) 

Answer 1

在SQL Server中使用新的merge命令2008年会，据我可以收集为：

merge Table t 
using (select 1000 as Something, 1 as Qty) s on t.Something = s.Something 
when matched then 
    update set t.Qty = t.Qty + 1 
when not matched by target then 
    insert values (s.Something, s.Qty); 

这不是那么简单，因为合并是更高效的合并大集，而不仅仅是一个单一的记录。否则，您可以尝试更新记录，并在没有更新记录时插入一条记录：

update Table set Qty = Qty + 1 where Something = 1000 
if (@@rowcount = 0) begin 
    insert into Table (Something, Qty) values (1000, 1) 
end 

Answer 2

IF EXISTS(SELECT * FROM Table WHERE Something=1000) 
BEGIN 
UPDATE Table SET Qty = Qty + 1 WHERE Something=1000 
END 
ELSE 
BEGIN 
INSERT INTO Table(Something,Qty) VALUES(1000,1) 
END