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POsql delete cascade not working
 

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  1. POsql delete cascade not working
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    <p>I have a Microsoft SQL Database with 2 tables: dog and cat.</p> <p>"dog" table has a primary key column called "food", which is related to a column called "food" as well in the "cat" table, which acts as the foreign key.</p> <p>The relationship between the tables has an "on delete cascade" rule set, so when I delete a row from "dog" table, the relveant rows from "cat" table should be deleted as well.</p> <p>But the rows in "cat" table do net get deleted, they stay. I use the Microsoft SQL Database manager to delete the row in "dog" table.</p> <p>Any idea why this happens? do I need to use a special delete sql command to delete a row in this manner?</p> <p>//edit</p> <p>the script for the tables is:</p> <pre><code>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 </code></pre>
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    1. COWhich direction does the foreign key go? Does cat.food reference dog.food, or vv.?
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      1. UStdammers
    2. COCan you post the full DDL (including FK definitions) for both tables?
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      1. USMartin Smith
    3. COThe DDL you posted works fine for me. When I delete a `Period` it nukes out the corresponding exams. Is that what you were expecting? Also do you get any errors or it just fails silently?
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      1. USMartin Smith
 

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