为连接表中存在的Sql中的每一行返回位

Question

我想为在连接表中作为外来ke存在的每个rowID返回一个额外的计算列作为位。例如：Select PId, PName from Part where PId in (Select distinct FkPid in joined Part

结果应该像Pid | PNAME |位|

由于

Answer 1

Select PId, PName, CAST(CASE WHEN B.fkPid IS NULL THEN 0 ELSE 1 END AS BIT) ExistsOtherTable
from Part A
LEFT JOIN (Select distinct FkPid FROM [joined Part]) B
ON A.PId = B.fkPid

Answer 2

只需左转加入!!!!

Select PId, PName, cast (isnull(OtherTable.FkPid,0) as bit) as [Bit]  from Part left join 
OtherTable on Part.PId=OtherTable.FkPid