sql删除级联不起作用

Question

我有一个带有2个表的Microsoft SQL数据库:dog和cat.

"dog"表有一个名为"food"的主键列,它与"cat"表中的一个名为"food"的列有关,该表用作外键.

表之间的关系有一个"on delete cascade"规则集,所以当我从"dog"表中删除一行时,"cat"表中的relveant行也应该被删除.

但是"cat"表中的行会被net删除,它们会保留.我使用Microsoft SQL数据库管理器删除"dog"表中的行.

知道为什么会这样吗？我是否需要使用特殊的delete sql命令以这种方式删除行？

//编辑

表的脚本是:

USE [VELES]
GO
/****** Object:  Table [dbo].[Periods]    Script Date: 01/18/2011 14:52:19 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Periods](
    [PeriodID] [int] IDENTITY(1,1) NOT FOR REPLICATION NOT NULL,
    [PeriodName] [nvarchar](50) COLLATE Hebrew_CS_AS NULL,
    [PeriodStartDate] [smalldatetime] NOT NULL,
    [PeriodEndDate] [smalldatetime] NOT NULL,
 CONSTRAINT [PK_Periods] PRIMARY KEY CLUSTERED 
(
    [PeriodID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]


USE [VELES]
GO
/****** Object:  Table [dbo].[Exams]    Script Date: 01/18/2011 14:55:37 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Exams](
    [ExamID] [int] IDENTITY(1,1) NOT NULL,
    [ExamUserID] [char](7) COLLATE Hebrew_CS_AS NOT NULL,
    [ExamBase] [tinyint] NOT NULL,
    [ExamUserTimesAccessed] [tinyint] NULL,
    [ExamMaxTimesToOpen] [tinyint] NOT NULL,
    [ExamUserLastTimeOpened] [datetime] NULL,
    [ExamUserLastTimeFinished] [datetime] NULL,
    [ExamTimeToFinish] [int] NOT NULL,
    [ExamPassGrade] [int] NOT NULL,
    [ExamPeriod] [int] NOT NULL,
    [ExamUserRank] [tinyint] NULL,
 CONSTRAINT [PK_Exams] PRIMARY KEY CLUSTERED 
(
    [ExamID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF
GO
USE [VELES]
GO
ALTER TABLE [dbo].[Exams]  WITH CHECK ADD  CONSTRAINT [FK_Exams_Bases] FOREIGN KEY([ExamBase])
REFERENCES [dbo].[Bases] ([BaseID])
ON UPDATE CASCADE
ON DELETE CASCADE
GO
ALTER TABLE [dbo].[Exams]  WITH NOCHECK ADD  CONSTRAINT [FK_Exams_Periods] FOREIGN KEY([ExamPeriod])
REFERENCES [dbo].[Periods] ([PeriodID])
ON UPDATE CASCADE
ON DELETE CASCADE
GO
ALTER TABLE [dbo].[Exams]  WITH NOCHECK ADD  CONSTRAINT [FK_Exams_Users] FOREIGN KEY([ExamUserID])
REFERENCES [dbo].[Users] ([UserID])
ON UPDATE CASCADE
ON DELETE CASCADE
NOT FOR REPLICATION 
GO
ALTER TABLE [dbo].[Exams] CHECK CONSTRAINT [FK_Exams_Users]
GO
ALTER TABLE [dbo].[Exams]  WITH CHECK ADD  CONSTRAINT [UserRanks_Exams_FK1] FOREIGN KEY([ExamUserRank])
REFERENCES [dbo].[UserRanks] ([RankID])
ON UPDATE CASCADE
ON DELETE CASCADE

Answer 1

我已经解决了这个问题.

在关系窗口中,有一个名为的选项Enforce Foreign Key Constraint,设置为"否".我将其设置为"是",现在行删除效果很好.