Question

select COALESCE([ItemSlotX],0) as [ItemSlotX],COALESCE([ItemSlotY], 0 ) as [ItemSlotY] from [PowerUP_Items] where [ItemIndex]=16 and [ItemGroup]=255

在我的情况下，没有记录。

如果没有找到记录，如何为ItemSlotX返回0，为ItemSlotY返回0？

Answer 1

如果您想要结果，即使没有匹配的行，也请使用：

select COALESCE([ItemSlotX],0) as [ItemSlotX],COALESCE([ItemSlotY], 0 ) as [ItemSlotY]
from (select null dummy ) d
left
outer
join [PowerUP_Items]
on   [ItemIndex]=16 and [ItemGroup]=255

Answer 2

此？

select ItemSlotX, ItemSlotY from PowerUP_Items where ItemIndex=16 and ItemGroup=255
if @@rowcount = 0
    select 0 as ItemSlotX, 0 as ItemSlotY

或更一般的方法：

if exists (select * from PowerUP_Items where ItemIndex=16 and ItemGroup=255)
    select ItemSlotX, ItemSlotY from PowerUP_Items where ItemIndex=16 and ItemGroup=255
else
    select 0 as ItemSlotX, 0 as ItemSlotY

Answer 3

如果您的查询必须返回不超过一行，请尝试此

select COALESCE(max([ItemSlotX]),0) as [ItemSlotX],COALESCE(max([ItemSlotY]), 0 ) as [ItemSlotY] 
from [PowerUP_Items] where [ItemIndex]=16 and [ItemGroup]=255

MSSQL返回0表示空白

3 个答案: