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10.22.2007 at 12:02PM PDT, ID: 22909898
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9.4

Create insert/update trigger to perform the function of a foreign key constraint

Asked by servantis in MS SQL Server

Tags: , , , ,

I need to create a SQL Server trigger which performs the same function as a foreign key constraint (the database is structured in such a way that it doesn't have FK integrity) . I have an PRODUCT table and an ACCOUNTS table.

I need to ensure that when records are inserted or updated in the ACCOUNTS table, a valid PRODUCTID is entered, however, null is also acceptable.

Is it possible to create an insert/update trigger which does the following check: SELECT DISTINCT PRODUCTID FROM PRODUCT each time an insert or udpate is run?

E.g. Product table (PK is PRODUCTID and DATEID)
PRODUCTID    DATEID      PRODUCTNAME
1                     2007           Product 1
2                     2007           Product 2

INSERT INTO ACCOUNTS (ACCOUNTID, BALANCE, PRODUCTID) values (1, 100, 1) - accepted
INSERT INTO ACCOUNTS (ACCOUNTID, BALANCE, PRODUCTID) values (1, 100, 3) - rejected, non-existent PRODUCTIDStart Free Trial
 
 
[+][-]10.22.2007 at 03:00PM PDT, ID: 20127279

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[+][-]10.23.2007 at 02:11AM PDT, ID: 20129483

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[+][-]10.23.2007 at 09:34AM PDT, ID: 20132309

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About this solution

Zone: MS SQL Server
Tags: trigger, insert, update, create, key
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Solution Provided By: ScottPletcher
Participating Experts: 1
Solution Grade: A
 
 
[+][-]10.24.2007 at 10:39AM PDT, ID: 20141135

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[+][-]10.24.2007 at 11:35AM PDT, ID: 20141663

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[+][-]10.24.2007 at 12:53PM PDT, ID: 20142342

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