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by: Marek Lewczuk |
last post by:
Hello,
I have a strange problem, maybe some of you will be able to explain me
something. I use LEFT JOIN as a substitute for subselects. It's true
that many subselects can be rewriten using LEFT JOIN. I have made a
query which use LEFT JOIN statement and... when there are many LEFT
JOIN's (over 3) on the same table MySQL execute this query very long
time... few hours or more. Maybe there is something wrong with my table
structures... Are...
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by: Soefara |
last post by:
Dear Sirs,
I am experiencing strange results when trying to optimize a LEFT JOIN
on 3 tables using MySQL.
Given 3 tables A, B, C such as the following:
create table A (
uniqueId int not null default 0 auto_increment,
a1 varchar(64) not null default '',
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by: Paul Bramscher |
last post by:
Here's one for pathological SQL programmers.
I've got a table of things called elements. They're components, sort of
like amino acids, which come together to form complex web pages -- as
nodes in trees which form parent-child relationships, sort of like
newsgroups. For example, the parent_id field points to another element.
Indent_level is there for denormalization purposes, to avoid costly
recursive issues in querying. The...
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by: jbm05 |
last post by:
Hi,
I'm curious about the computational complexity of a query I have. The
query contains multiple nested self left joins, starting with a simple
select, then doing a self left join with the results, then doing a self
left join with those results, etc. What puzzles me is that the time
required for the query seems to grow exponentially as I add additional
left joins, which I didn't expect. I expected the inner select to
return about 25...
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by: Dam |
last post by:
Using SqlServer :
Query 1 :
SELECT def.lID as IdDefinition,
TDC_AUneValeur.VALEURDERETOUR as ValeurDeRetour
FROM serveur.Data_tblDEFINITIONTABLEDECODES def,
serveur.Data_tblTABLEDECODEAUNEVALEUR TDC_AUneValeur
where def.TYPEDETABLEDECODES = 4
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by: Ian Boyd |
last post by:
i know nothing about DB2, but i'm sure this must be possible.
i'm trying to get a client to create a view (which it turns out is called a
"Logical" in DB2). The query needs a LEFT OUTER JOIN, but he doesn't know
how to do that, or even if he can, and i don't have to time to learn DB2
from scratch right now.
The following SQL Query is a trimmed sample of the full View (i.e. Logical)
definition - and i would create it on an SQL based...
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by: tricard |
last post by:
Good day all,
I have a large outer joined query that I want to have some criteria.
The select query is gathering all part numbers from tblPartNumbers,
left joining to tblPartNumberVendor (since more than one vendor can
make the part), then left joining to tblPartNumberSupplier (since more
than one supplier can distribute the vendor's part), then left joining
to tblPartNumberCost (since more than one cost can be associated with a
single...
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by: naveenchhibber |
last post by:
Hi all
pls tell me that the following statment is valid in oracle 9i or 10g..
update ws
set received_by_facility = coalesce(rbf_ouk.organizational_unit_id, 0),
assigned_to_facility = coalesce(atf_ouk.organizational_unit_id, 0),
received_by_team = coalesce(rbt_ouk.organizational_unit_id, 0),
assigned_to_team = coalesce(att_ouk.organizational_unit_id, 0)
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by: Roderik |
last post by:
Hi,
On my website I implemented tooltip alike layers when you hover the
category items in the sidebar on the right.
See: http://www.roderik.net/
The layers that become visible have a opacity value of .8 and contain a
background image. The effect is as expexted.
However, the anti-aliasing is very poor in both Internet Explorer 7 and
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by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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