Greetings!
I've recently been trying to do something, which apparently looks like
it may be a little odd.. I'm not finding anything in the manuals or
anywhere on the web where something similiar is being done.. so it
looks like my two options now are to post for some assistance, or find
another way to accomplish my task.
Basically, what I'm trying to do is select the number of duplicate
entries from a table using three columns. There is one primary key with
the table (and that seems to be what's throwing me off). Here's an
example:
mysqlSELECT *, COUNT(*) FROM tbBillingLineIt ems GROUP BY user_id,
pull_start, item_type HAVING COUNT(*) 1;
+---------+---------+------------+-----------+--------+-----------------+-------------+------------+-------+----------+
| item_id | user_id | pull_start | item_type | amount | amount_per_item
| total_items | free_items | notes | COUNT(*) |
+---------+---------+------------+-----------+--------+-----------------+-------------+------------+-------+----------+
| 52 | 1 | 1157068800 | 1 | 0.00 | 0.01
| 2 | 5 | NULL | 8 |
| 53 | 1 | 1157068800 | 2 | 0.19 | 0.01
| 24 | 5 | NULL | 8 |
| 54 | 1 | 1157068800 | 3 | 10.00 | 10.00
| 1 | 0 | NULL | 8 |
| 55 | 2 | 1157068800 | 1 | 11.00 | 0.10
| 115 | 5 | NULL | 8 |
| 56 | 2 | 1157068800 | 2 | 4.60 | 0.02
| 236 | 5 | NULL | 8 |
| 51 | 2 | 1157068800 | 3 | 5.00 | 5.00
| 1 | 0 | NULL | 8 |
+---------+---------+------------+-----------+--------+-----------------+-------------+------------+-------+----------+
6 rows in set (0.00 sec)
What I'm looking to do, is pull the eight items that are being
matched.. I need to delete all but one copy of them. This is used in
the event that an application is run multiple times, it will create too
many entries into the database which need to be removed. Since the
primary key cannot be used to determine unique values, what I use
instead is the timestamp in which the entries are being run for, the
type of item it is, and the user_id the item is for.
In essence, what I'm looking for is something to delete all duplicate
entries from the table, based on user_id, pull_start, and item_type. If
I can figure out a way to get the item_id for each of these items that
were deemed duplicate (as indicated by the resulting COUNT(*)), then I
can delete them from there with a temporary table or a simple script.
One way to accomplish this that I've found was to repeat execution of
this query multiple times until there are no more duplicate items
returned.. but I'm sure there has to be a more efficient way.. I'm open
to any and all suggestions.
Thanks!
Michael Martinek 1 17243
Here is my scripted solution, for anyone who might be interested or
possibly running into the same wall as I am.
<?php
mysql_connect(' dbHost','dbUser ','dbPassword') or die('Unable to connect
to database.');
mysql_select_db ('dbName') or die('Unable to select database.');
$sSQL = 'CREATE TEMPORARY TABLE dupes SELECT *, COUNT(*) - 1 AS cnt
FROM'
.' tbBillingLineIt ems GROUP BY user_id, pull_start, item_type'
.' HAVING COUNT(*) 1 ORDER BY item_id';
mysql_query($sS QL);
$sSQL = 'SELECT * FROM dupes';
if ($mRes = mysql_query($sS QL)) {
while ($mRow = mysql_fetch_ass oc($mRes)) {
$sSQL = sprintf('DELETE FROM tbBillingLineIt ems WHERE
user_id = %u AND pull_start = %u AND item_type = %u LIMIT %u',
$mRow['user_id'], $mRow['pull_start'],
$mRow['item_type'], $mRow['cnt']
);
mysql_query($sS QL);
}
mysql_free_resu lt($mRes);
}
mysql_close();
?>
Of course, I'd prefer not to have to do it in a fashion like this.. but
if I have to, ah well. At least it works. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Philip Stoev |
last post by:
Hi all,
Please tell me if any of this makes sense. Any pointers to relevant
projects/articles will be much appreciated.
Philip Stoev
http://www.stoev.org/pivot/manifest.htm
===================================
|
by: Mike Chirico |
last post by:
Interesting Things to Know about MySQL
Mike Chirico (mchirico@users.sourceforge.net)
Copyright (GPU Free Documentation License) 2004
Last Updated: Mon Jun 7 10:37:28 EDT 2004
The latest version of this document can be found at:
http://prdownloads.sourceforge.net/souptonuts/README_mysql.txt?download
|
by: Matik |
last post by:
Hello everyone,
Small and (I think) very simple quesiton;-) which makes me creazy.
Let's say I have two tables listed below:
T1
====
IDX
====
1
|
by: andreas.muller |
last post by:
Hello everyone,
I'm trying to solve this problem but can't seem to figure out how to
start. I would like to create a rating system where people can vote
(1-5 stars) on randomly displayed items. The randomly displayed items
should either have very high ratings OR a very low number of ratings.
For example, only return items in the top 20th percentile *OR* items
with fewer than 5 votes.
The question is, how would I write an SQL query to...
|
by: sneha123 |
last post by:
There will be some 20 questions and for each question there will be 4
choices.what i want to do is to select multiple answers by clicking the
checkbox. i m using asp.net,vb.net
pls help me
we have written the code using radio button for selecting single
item.but we want to replace it with checkbox to select multiple items.
the code using radio button is given below .pls correct it with
checkbox
| |
by: ericv |
last post by:
I have 3500 records in a table - each record has a unique value (KEY_ID
field), but some records share the same value (in a field called
POLE_ID) So, there may be 3 records that have the POLE_ID of 25, 4
records with the POLE_ID of 31, etc. I would like to grab all the
records in the table that share POLE_ID's - that is, select out the
records where there is more than 1 of the same POLE_ID value.
I then want to populate a form using this...
|
by: renfrochris |
last post by:
I'm having difficulty finding the correct syntax that will allow me to
select a group of invoices based on the total of an amount column
located in its line items. Below are simplified examples of my XML and
XSLT files:
XML FILE
<?xml version="1.0" standalone="yes"?>
<?xml-stylesheet type="text/xsl"
href="OutstandingInvoiceBalances.xslt"?>
|
by: Catch_22 |
last post by:
Hi,
I have a stored procedure that has to extract the child records for
particular parent records.
The issue is that in some cases I do not want to extract all the child
records only a certain number of them.
Firstly I identify all the parent records that have the requird number
of child records and insert them into the result table.
|
by: Atli |
last post by:
This is an easy to digest 12 step guide on basics of using MySQL. It's a great refresher for those who need it and it work's great for first time MySQL users.
Anyone should be able to get through this without much trouble. Programming knowledge is not required.
Index
What is SQL?
Why MySQL?
Installing MySQL.
Using the MySQL command line interface
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
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,...
| |
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...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
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...
|
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...
|
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();...
|
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...
| |
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...
| | |