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

x
?
Solved

Update query help

Posted on 2010-08-16
6
Medium Priority
?
319 Views
Last Modified: 2012-05-10
OK, got these tables in my e-commerce system.
CREATE TABLE `ps_feature_value_lang` (
	`id_feature_value` INT(10) UNSIGNED NOT NULL,
	`id_lang` INT(10) UNSIGNED NOT NULL,
	`value` VARCHAR(255) NULL DEFAULT NULL,
        <SNIP INDEXES>
)

CREATE TABLE `ps_feature_product` (
	`id_feature` INT(10) UNSIGNED NOT NULL,
	`id_product` INT(10) UNSIGNED NOT NULL,
	`id_feature_value` INT(10) UNSIGNED NOT NULL,
        <SNIP INDEXES>
)

CREATE TABLE `ps_product` (
	`id_product` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
	`id_supplier` INT(10) UNSIGNED NULL DEFAULT NULL,
	`id_manufacturer` INT(10) UNSIGNED NULL DEFAULT NULL,
        <SNIP columns>
	`reference` VARCHAR(32) NULL DEFAULT NULL,
        <SNIP more columns>
        <SNIP INDEXES>
)

Open in new window


I need to update the ps_product.reference value with the ps_feature_value_lang.value where the ps_feature_value_lang.id_lang = 1 and ps_feature_product.id_product = ps_product.id_product

This query isn't doing what I expected, it replaced them with one single value.
UPDATE ps_product p 
SET p.reference = 
  (SELECT fvl.value FROM ps_feature_value_lang fvl
   INNER JOIN ps_feature_product fp ON fp.id_feature_value = fvl.id_feature_value
   WHERE fp.id_feature = 1 
   AND   fp.id_product = p.id_product 
   AND   fvl.id_lang = 1
   AND   TRIM(p.reference)='')

Open in new window

0
Comment
Question by:EddieShipman
[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
  • 3
6 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 33449320
I presume you want this:
UPDATE ps_product p 
SET p.reference = 
  (SELECT group_concat(fvl.value) FROM ps_feature_value_lang fvl
   INNER JOIN ps_feature_product fp ON fp.id_feature_value = fvl.id_feature_value
   WHERE fp.id_feature = 1 
   AND   fp.id_product = p.id_product 
   AND   fvl.id_lang = 1
   AND   TRIM(p.reference)='')

Open in new window

0
 
LVL 26

Author Comment

by:EddieShipman
ID: 33449604
I'm not sure what group_concat does for me, can you explain? SHouldn't I also be using a DISTINCT in the select, though?
0
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 1500 total points
ID: 33452171
well, you wrote:
>, it replaced them with one single value.

group_concat will build up a list of all the found values (comma-separated)

>SHouldn't I also be using a DISTINCT in the select, though?
SELECT group_concat(distinct fvl.value)

should do that ...
0
Get free NFR key for Veeam Availability Suite 9.5

Veeam is happy to provide a free NFR license (1 year, 2 sockets) to all certified IT Pros. The license allows for the non-production use of Veeam Availability Suite v9.5 in your home lab, without any feature limitations. It works for both VMware and Hyper-V environments

 
LVL 26

Author Comment

by:EddieShipman
ID: 33453474
[quote]group_concat will build up a list of all the found values (comma-separated)[/quote]

Who said I wanted a comma sepearated list of values?
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 33453507
well, please show with data samples what you need.
0
 
LVL 26

Author Closing Comment

by:EddieShipman
ID: 33454596
I no longer need this as I am reloading my tables from scratch.
Thanks...
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

Does the idea of dealing with bits scare or confuse you? Does it seem like a waste of time in an age where we all have terabytes of storage? If so, you're missing out on one of the core tools in every professional programmer's toolbox. Learn how to …
This post contains step-by-step instructions for setting up alerting in Percona Monitoring and Management (PMM) using Grafana.
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

610 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