Sql server 2012 如何根据SQL中另一个表列中的值选择位

我想做的是使用一个SELECT语句并选择两列，其中一列是根据联接表列值生成的位

SELECT [User].Id, 0 --this bit must change depending on Rule.Id 
FROM [dbo].[User] User
INNER JOIN [dbo].[Rule] Rule
ON [Rule].Id = 8
WHERE [User].UserId = @userId
AND [User].ShopId = @shopId

因此，如果Rule.Id=8，则该位必须为1 如果Rule.Id=5，则位为0，否则位为0

SELECT [User].Id,case when  Rule.Id = 8 then 1 when  Rule.Id = 5 then 0 else 0 end  as bit
FROM [dbo].[User] User
INNER JOIN [dbo].[Rule] Rule
ON [Rule].Id = 8
WHERE [User].UserId = @userId
AND [User].ShopId = @shopId

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如果您使用的是SQL Server，则可以使用CASE函数

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用mysql标记。是否确定？请从my_表中选择rule.id=8 my_位。它表示无法绑定多部分标识符。谢谢，编辑了原始postwhy join on the rule？因为查询需要rules.id。

SELECT [User].Id, Case Rule.id when 8 Then 1 Else 0 End as MyBit FROM [dbo].[User] User INNER JOIN  dbo].[Rule] Rule ON [Rule].Id = 8 WHERE [User].UserId = @userId AND [User].ShopId = @shopId