Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

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
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]%'

Open in new window


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.
U.S. Department of Agriculture and Acronis Access

With the new era of mobile computing, smartphones and tablets, wireless communications and cloud services, the USDA sought to take advantage of a mobilized workforce and the blurring lines between personal and corporate computing resources.

LVL 59

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]%'

Open in new window


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 59

Expert Comment

by:Kevin Cross
ID: 22872919

Featured Post

The Eight Noble Truths of Backup and Recovery

How can IT departments tackle the challenges of a Big Data world? This white paper provides a roadmap to success and helps companies ensure that all their data is safe and secure, no matter if it resides on-premise with physical or virtual machines or in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Using SQL*PLUS issue with where statement with trunc function 3 29
SQL query and VBA 5 46
TSQL XML Namespaces 7 23
SQL Recursion 6 19
Confronted with some SQL you don't know can be a daunting task. It can be even more daunting if that SQL carries some of the old secret codes used in the Ye Olde query syntax, such as: (+)     as used in Oracle;     *=     =*    as used in Sybase …
JSON is being used more and more, besides XML, and you surely wanted to parse the data out into SQL instead of doing it in some Javascript. The below function in SQL Server can do the job for you, returning a quick table with the parsed data.
Via a live example, show how to extract information from SQL Server on Database, Connection and Server properties
Viewers will learn how the fundamental information of how to create a table.

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question