Cannot delete on inner join

Posted on 2008-11-02
Last Modified: 2008-12-18
I have a couple of bad records that i need to delete from my customer table and also remove the corresponding address record.
I can return all the rows I need to delete with;

select *      
from       dbo.CUSTOMER inner join            dbo.ADDRESS
on            customer.home_address = address.address_code
where      customer_code      like      '%[^0-9]%'

but changing the query above to

delete *      
from       dbo.CUSTOMER inner join            dbo.ADDRESS
on            customer.home_address = address.address_code
where      customer_code      like      '%[^0-9]%'

does not work not sure what I am missing.
Question by:sweetaz
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LVL 22

Assisted Solution

by:Kelvin Sparks
Kelvin Sparks earned 70 total points
ID: 22864206
You cannot delete from customers while there is a corresponding record in address. Either upgrade the table relationships to allows cascade deletes between these two tables or delete the address records first, then the customer records.

LVL 17

Assisted Solution

HuyBD earned 80 total points
ID: 22864392
try this
delete dbo.CUSTOMER    
from       dbo.CUSTOMER inner join            dbo.ADDRESS
on            customer.home_address = address.address_code
where      customer_code      like      '%[^0-9]%'

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Author Comment

ID: 22864528
thanks HuyBD b ut the query you suggest only seems to remove the records from customer table and not the address table.
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LVL 60

Accepted Solution

Kevin Cross earned 100 total points
ID: 22866336
Kelvin's first comment is correct.  You cannot delete from both.  HuyBD's suggestion helps you with syntax on proper delete using the relationship to do the filtering, so in your case it appears that CUSTOMER table has the key to finding records to delete so you want to do this (unless you enable cascading delete from CUSTOMER to ADDRESS table.
-- delete matching addresses
INNER JOIN dbo.CUSTOMER c ON c.home_address = a.address_code
WHERE c.customer_code LIKE '%[^0-9]%'
-- delete matching customers
WHERE c.customer_code LIKE '%[^0-9]%'

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Author Comment

ID: 22871747
thanks mwvisa1 this actually did occur to me lastnight. I should wait 24 hours before commenting! I blame monday-itis.  
LVL 60

Expert Comment

by:Kevin Cross
ID: 22872919

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