Two Tables with cascade delete


Two Tables with cascade delete



I have two tables:


[tbl_Records_DR] PK DAutoID.
[tbl_Records_DR_Explain] PK DRefer_ID



I'm creating my tables programmatically (only).



Here's what I currently have that works well creating the tables:


CREATE TABLE [tbl_Records_DR] ( " _
& "[DAutoID] int IDENTITY (1,1) PRIMARY KEY NOT NULL " _
& ", [Hub_Unique_Name] nvarchar(30) DEFAULT '' NULL " _
& ", [DStatus] nvarchar(30) DEFAULT '' NULL " _
& ", [DDate] datetime NULL " _
& ", [DTime_Start] datetime NULL " _
& ", [ReportCreatedFrom] nvarchar(5) DEFAULT 'DR' NULL);")

CREATE TABLE [tbl_Records_DR_Explain] ( " _
& "[AutoID] int IDENTITY (1,1) NOT NULL " _
& ", [DRefer_ID] int PRIMARY KEY NOT NULL " _
& ", [DExplain] nvarchar(700) DEFAULT '' NULL " _
& ", [ImportCompleted] bit DEFAULT 0 NULL;")



Thanks,
ADawn





Do you already have the field defined in tbl_Records_DR_Explain that points to tbl_Records_DR? Microsoft Docs has detailed information on creating foreign keys: docs.microsoft.com/en-us/sql/relational-databases/tables/…
– Zack
Jun 29 at 16:58


tbl_Records_DR_Explain


tbl_Records_DR





Why are you creating tables in a program like this? Seems like a lot of effort to write code that can't run more than once.
– Sean Lange
Jun 29 at 19:21




2 Answers
2



Use ALTER TABLE to change one of this tables and add FOREIGN KEY. Hope i help you


ALTER TABLE


FOREIGN KEY



I think this is what you want:


ALTER TABLE [tbl_Records_DR_Explain]
ADD CONSTRAINT fk_AutoID
FOREIGN KEY ([DRefer_ID])
REFERENCES [tbl_Records_DR] ([DAutoID])
ON DELETE CASCADE;



Edit


CREATE TABLE [tbl_Records_DR_Explain] (
[AutoID] int IDENTITY (1,1) PRIMARY KEY NOT NULL
, [DRefer_ID] int NOT NULL
, [DExplain] nvarchar(700) DEFAULT '' NULL
, [ImportCompleted] bit DEFAULT 0 NULL
CONSTRAINT fk_AutoID
FOREIGN KEY (DRefer_ID)
REFERENCES [tbl_Records_DR] ([DAutoID])
ON DELETE CASCADE
)



http://rextester.com/NZH15043





Do I ALTER TABLE after I create it? Or is there a way to do what you suggest when the table is created?
– tropicwhisper
Jun 29 at 17:37






Added edit to include the FK in the original creation of table instead of altering table after
– Ian-Fogelman
Jun 29 at 17:43






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