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by: StealthBananaT |
last post by:
My database has two tables - films has 10,000 records and reviews has 20,000 records. Whenever I try to list all the films and the
count of its reviews, MySQL locks and I have to restart the service.
Here's the SQL...
SELECT films.*, COUNT(reviews.id)
FROM films LEFT JOIN reviews ON films.id = reviews.filmID
GROUP BY films.id
LIMIT 0, 100;
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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: Marek Kotowski |
last post by:
In MySQL online documentation there are some examples with
multi-tables left joins. But all of them are like this (taken from the
documentation):
SELECT ...
FROM table1
LEFT JOIN table2 on (table1.id = table2.id)
LEFT JOIN table3 on (table1.id2 = table3.id2)
LEFT JOIN table4 on (table1.id3 = table4.id3)
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by: Eric |
last post by:
Hi Folks,
Lets assume I have three tables. Their layout is as follows. Please
note that tblPeople does not have an entry for Denver (this is my
problem)
tblCity
_________________
CityName OCID
LA 1
Denver 2
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by: Quarco |
last post by:
Hi,
Suppose I have a query like:
SELECT
products.name AS product,
SUM(IF(stock.invoice=0,1,0)) AS in_stock,
SUM(IF(shopcart.status=1,1,0)) AS reserved
FROM products
LEFT JOIN stock ON products.id=stock.product_id
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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: Steve |
last post by:
I have a SQL query I'm invoking via VB6 & ADO 2.8, that requires three
"Left Outer Joins" in order to return every transaction for a specific
set of criteria.
Using three "Left Outer Joins" slows the system down considerably.
I've tried creating a temp db, but I can't figure out how to execute
two select commands. (It throws the exception "The column prefix
'tempdb' does not match with a table name or alias name used in the
query.")
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by: deko |
last post by:
SELECT tblTxAcct.TxAcctName, tblTxType.TxTypeName,
Nz(qryTxAcctListCt.TxCount, 0) AS TxCt
FROM (tblTxAcct INNER JOIN tblTxType ON
tblTxAcct.TxType_ID=tblTxType.TxType_ID) LEFT JOIN qryTxAcctListCt ON
tblTxAcct.TxAcct_ID=qryTxAcctListCt.TxAcct_ID;
I use this query as a RecordSource for a Datasheet that displays Accounts,
Types, and the number of Transactions in each Account. An Account cannot
exist outside of a Type, but an Account...
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by: Doug |
last post by:
Hi,
I'm more familiar with MSSQL than Access syntax and have run into a problem
with correctly putting ( )'s around the joins in a 3 table query. I want to
INNER JOIN lenders and accounts and LEFT OUTER JOIN that result with
prospects. (I want to receive all the results of the inner join and any
pertinent info from table 3 that is available.)
The way it was written in MSSQL was basically..
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by: shapper |
last post by:
Hello,
I am used to SQL but I am starting to use LINQ.
How can I create Left, Right and Inner joins in LINQ? How to
distinguish the different joins?
Here is a great SQL example:
http://www.codinghorror.com/blog/archives/000976.html
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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: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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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: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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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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