Solved

mysql DELETE  "gets stuck"

Posted on 2014-12-01
6
233 Views
Last Modified: 2014-12-01
I've inherited the following "nested" DELETE query,
where the desire is to delete those records in the Purchase_order_details table that
are referred to in the Sales_order_details  table.

tblPOdetails                           tblSOdetails
po_detail_key    <-------------- po_detail_key
                                                 so_header_key   =   123456  (a specific value when handed to mySQL)

DELETE FROM tblPurchase_order_details       
                        WHERE po_detail_key IN
                              (SELECT po_detail_key FROM tblSales_order_details
                                    WHERE so_header_key='{$SOHID']}'
                              )

The server shows the mySQL state of this query to be          "Sending data"
and it's stuck there until i restart mySQL on the server.

I can unravel the "nested" query to be implemented using a PHP loop, but wondering if there's
a way it can work WITHIN mySQL?

p.s. it's INNODB with no constraints defined,  all other queries work fine.
the design, etc.  had been translated from an ASP/Microsoft implementation from 15+ yrs ago.
0
Comment
Question by:willsherwood
[X]
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
  • 3
  • 2
6 Comments
 
LVL 83

Expert Comment

by:Dave Baldwin
ID: 40474656
This '{$SOHID']}' is not a valid anything that I know of.  Please post the actual code in the 'code' format so we can see what you are actually doing.  You can replace any sensitive data but otherwise keep the code as it is found.  Like this...

DELETE FROM tblPurchase_order_details       
                        WHERE po_detail_key IN
                              (SELECT po_detail_key FROM tblSales_order_details
                                    WHERE so_header_key='{$SOHID']}'
                              ) 

Open in new window

0
 
LVL 58

Accepted Solution

by:
Gary earned 500 total points
ID: 40474660
Is this your exact sql as you have a square bracket and a nested apostrophe

'{$SOHID']}'

DELETE tblPurchase_order_details FROM  tblPurchase_order_details 
	INNER JOIN tblSales_order_details 
		ON tblSales_order_details.po_detail_key = tblPurchase_order_details.po_detail_key
	WHERE so_header_key='{$SOHID}'

Open in new window

0
 

Author Comment

by:willsherwood
ID: 40474713
sorry for the copy/paste typo.

the  '{$SOHID}'  is a PHP variable that expands to a literal/constant for the query

i'll try your INNER JOIN now !
0
How our DevOps Teams Maximize Uptime

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us. Read the use case whitepaper.

 

Author Closing Comment

by:willsherwood
ID: 40474725
super, thanks for your help in translating to use  INNER JOIN - a great help!
0
 

Author Comment

by:willsherwood
ID: 40474730
p.s.   just curious why something like this would "hang" mySQL for THIS database  when executed
 (other db were operational
during the period that this  query took hold of the the database)
0
 
LVL 58

Expert Comment

by:Gary
ID: 40474758
Could be several things without knowing the db setup. But a join is better than a nested select which involves more work.
0

Featured Post

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.

Question has a verified solution.

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

Introduction Since I wrote the original article about Handling Date and Time in PHP and MySQL several years ago, it seemed like now was a good time to update it for object-oriented PHP.  This article does that, replacing as much as possible the pr…
Containers like Docker and Rocket are getting more popular every day. In my conversations with customers, they consistently ask what containers are and how they can use them in their environment. If you’re as curious as most people, read on. . .
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.

734 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