Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

MySQL: DELETE / JOIN

Posted on 2011-09-07
5
Medium Priority
?
365 Views
Last Modified: 2012-05-12
I want to delete all rows from `Group_Members` where `GroupID` equals  '27' and its `UserSuspended` value from the `Member` table, joined on `ID` equals  '1'
DELETE FROM `Group_Members` JOIN `Member` ON `ID` WHERE `Member.UserSuspended` = '1' and `Group_Members.GroupID` = '27'

Open in new window

0
Comment
Question by:hankknight
[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
5 Comments
 
LVL 82

Expert Comment

by:hielo
ID: 36497586
ON `ID`=?WHAT? (what's the "common/joining column)

Also, you need the backticks around the TABLE AND Field name when using table.field.

WRONG:
`Group_Members.GroupID`

Correct:
`Group_Members`.`GroupID`


Back up you db first and then Try:
DELETE FROM `Group_Members` JOIN `Member` ON `Member`.`ID`=`Group_Members`.`GroupID` WHERE `Member`.`UserSuspended` = '1' and `Group_Members`.`GroupID` = '27'

0
 
LVL 16

Author Comment

by:hankknight
ID: 36497925
Thanks, but I get an error:

Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'JOIN `Member` ON `Member`.`ID`=`Group_Members`.`GroupID` WHERE `Member`.`Use' at line 2

Any idea how I could figure out what is wrong?
DELETE FROM `Group_Members` 
JOIN `Member` 
ON `Member`.`ID`=`Group_Members`.`GroupID` 
WHERE `Member`.`UserSuspended` = '1' 
AND `Group_Members`.`GroupID` = '22'

Open in new window

0
 
LVL 82

Expert Comment

by:hielo
ID: 36497999
list all the tables involved first, then do an inner join

DELETE FROM `Group_Members`,`Member`
INNER JOIN `Member`  
ON `Member`.`ID`=`Group_Members`.`GroupID`
WHERE `Member`.`UserSuspended` = '1'
AND `Group_Members`.`GroupID` = '22'

Also, if UserSuspended and GroupId are defined as numeric types on your db, get rid of the apostrophes around the values.
0
 
LVL 16

Author Comment

by:hankknight
ID: 36498220
This displays the records I want removed:
SELECT * 
FROM `Group_Members`
INNER JOIN `Member`
ON `Member`.`ID` = `Group_Members`.`MemberID`
WHERE `Group_Members`.`GroupID` = '22' AND `Member`.`UserSuspended` = '1'

Open in new window


However this gives an error:

DELETE
FROM `Group_Members`
INNER JOIN `Member`
ON `Member`.`ID` = `Group_Members`.`MemberID`
WHERE `Group_Members`.`GroupID` = '22' AND `Member`.`UserSuspended` = '1'

Open in new window


Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INNER JOIN `Member` ON `Member`.`ID` = `Group_Members`.`MemberID` WHERE `Group' at line 3


Is the problem with "DELETE FROM"?
0
 
LVL 82

Accepted Solution

by:
hielo earned 2000 total points
ID: 36498289
What part of "list all the tables involved first" did you not understand?

DELETE FROM `Group_Members` INNER JOIN...

is NOT the same as:

DELETE FROM `Group_Members`,`Member` INNER JOIN...


I even wrote the syntax for you! Try copy and paste.
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

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…
This article shows the steps required to install WordPress on Azure. Web Apps, Mobile Apps, API Apps, or Functions, in Azure all these run in an App Service plan. WordPress is no exception and requires an App Service Plan and Database to install
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses

636 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