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How do I return results for all records in a joined table query when they are missing from one of the joined tables?
Category : Databases

I have the following SQL query


SELECT tbl_product.prod_id,
ISNULL (prod_code, ') AS prod_code,
ISNULL (prod_category, ') AS prod_category,
ISNULL(prod_title, ') AS prod_title,
ISNULL(prod_price, 0.0) AS prod_price,
ISNULL(tbl_product.prod_

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Ordering joined query by multiple rows of the joined table
Category : Databases

I've got a posts table and a postmeta table which contains meta_key and meta_value columns. I've included a simplified table structure below (with some demo data).


CREATE TABLE `posts` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`title` varchar(200) NOT NULL DEFAULT ',
PRIMARY KEY (`id`)
) ENGINE=I

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Rails Mysql Find Joined Table's Joined Table By Date Created At Not Within n Months
Category : Databases

I am having a hard time with a query. This is in rails (2.1), but maybe I need a find_by_sql.


I have a companies table which has many clients, which have many groups. I need to find companies which have not had any clients with any groups within a certain amount of time (say 3 months).


The best I have come up with is this:


Company.all(:include => { :cli

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100+ tables to joined
Category : Databases

I was wondering if anyone ever had a change to measure how a would 100 joined tables perform?
Each table would have an ID column with primary index and all table are 1:1 related.


It is a common problem within many data entry applications where we need to collect 1000+ data points. One solution would be to have one big table with 1000+ columns and the alternative would be to sp


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TAGS : tables joined

JPA joined column allow every value
Category : Programming Languages

I'm testing JPA, in a simple case File/FileVersions tables (Master/Details), with OneToMany relation, I have this problem: in FileVersions table, the field "file_id" (responsable for the relation with File table) accepts every values, not only values from File table.


How can I use the JPA mapping to limit the input in FileVersion.file_id only for values existing in

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How to Leave a Job You've Only Just Joined
Category : Careers & Job Searching
Not every job is going to be your dream job. Sometimes you may have a gut feeling when you are not the right fit for a position. When you come to this realization, you have to make a decision. Are you willing to stick it out and learn more about the job? Or do you want to save the employer time and money by letting them know you don't wish to keep the position? By letting the employer know ahead

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How to Tell When You've Joined on Roblox
Category : Internet
Roblox is a website where supervised children can play games and entertain themselves online. Membership is free and kids must have permission from their parents prior to joining the site. The games and forums on Roblox are moderated by Roblox employees; inappropriate behavior and/or conversations are prohibited and anyone who chooses not to follow the rules ends up with a terminated account and c

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How to Cut a Flue Once it Has Been Joined
Category : Home & Garden
A flue is a metal pipe that is used to move exhaust products, from combustion appliances to the outside of the building. This pipe is important for the safety of a building because the gases inside are both hot and poisonous. You may need to cut an existing flue to add a vent dampener, draft inducer or to add another appliance to the flue. Turn the power off to any device attached to the vent befo

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TAGS : Flue Once Been Joined

Select when value not in joined table
Category : Programming Languages

I have two Entities (the entities are simplefied):


Participation


[ActiveRecord]
public class Participation
{
[PrimaryKey]
public int Id {get;set;}
[HasMany(...)]
public IList<ParticipationEvent> GeneratedEvents {get;set;}
}

And ParticipationEvent


[ActiveRecord]
pu

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Select with a Max in joined table
Category : Databases

I have 2 tables:


Table workflow


Request_Id, Step ID
123, 4
123, 7
198, 5

Table Steps


Step_Id, Step_num
4, 30
7, 12
5, 172

I am trying to return all records in table Workflow, where Steps.step_num is the max for that record.
My result should look like t


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