选择行不是在另一个表，SQL Server查询

Question

主题表

CREATE TABLE [dbo].[BS_Subject](
    [SubjectID] [bigint] IDENTITY(1,1) NOT NULL, 
    [DepartmentID] [bigint] NOT NULL, 
    [SubjectName] [varchar](50) NOT NULL, 
    [SubjectDescription] [varchar](100) NULL, 
    [SubjectShortCode] [varchar](10) NOT NULL, 
CONSTRAINT [PK_Subject] PRIMARY KEY CLUSTERED 
(
    [SubjectID] ASC 
) 

SubjectToClass表

CREATE TABLE [dbo].[BS_SubjectToClass](
[SubjectToClassID] [bigint] IDENTITY(1,1) NOT NULL, 
[SubjectID] [bigint] NOT NULL, 
[ClassID] [bigint] NOT NULL, 
CONSTRAINT [PK_BS_SubjectToClass] PRIMARY KEY CLUSTERED 
(
[SubjectToClassID] ASC 
) 

我需要列出所有行的Subject表，其中subjectid不SubjectToClass表的指定的类。

我有这个，但不能再往前走

select Distinct(BS_Subject.SubjectID) DepartmentID, 
     SubjectName, SubjectDescription, SubjectShortCode 
from dbo.BS_Subject 
where BS_Subject.SubjectID <> (
SELECT  Distinct(BS_Subject.SubjectID) 
FROM   dbo.BS_Subject, dbo.BS_SubjectToClass 
Where  BS_Subject.SubjectID = BS_SubjectToClass.SubjectID 
And BS_SubjectToClass.ClassID = 2) 

Answer 1

SELECT SubjectID, DepartmentID, SubjectName, SubjectDescription, SubjectShortCode 
FROM BS_Subject 
WHERE NOT EXISTS 
(SELECT SubjectToClassID FROM BS_SubjectToClass WHERE 
BS_Subject.SubjectID = BS_SubjectToClass.SubjectID 
AND BS_SubjectToClass.ClassID =2) 

Answer 2

您需要使用NOT IN运营商 - 而不是<>（这是VB或东西....）

SELECT 
    DISTINCT(BS_Subject.SubjectID) DepartmentID, 
    SubjectName, SubjectDescription, SubjectShortCode 
FROM dbo.BS_Subject 
WHERE 
    BS_Subject.SubjectID NOT IN 
     (SELECT DISTINCT(BS_Subject.SubjectID) 
     FROM dbo.BS_Subject, dbo.BS_SubjectToClass 
     WHERE BS_Subject.SubjectID = BS_SubjectToClass.SubjectID 
     AND BS_SubjectToClass.ClassID = 2)