Hi, I'm looking for an efficient way to do the following:
"given a column of entries with double values, select the greatest
value less than D", where D is given as the upper bound.
so if I have 0.1, 1.4, 10.11, 5.5 etc. then for D = 5, i should get
1.4.
My current solution stores all entries in an array and sorts them...
which I know is very very very inefficient.
2  1340 
stupid stupid me!:
select * from TABLE where value>0.0 and value<D order by value desc
limit 1;
ok, this works for me. thanks for reading!!!!
Shark wrote: Hi, I'm looking for an efficient way to do the following:
"given a column of entries with double values, select the greatest
value less than D", where D is given as the upper bound.
so if I have 0.1, 1.4, 10.11, 5.5 etc. then for D = 5, i should get
1.4.
My current solution stores all entries in an array and sorts them...
which I know is very very very inefficient.
SELECT
MAX(Number)
FROM
NUMBERS
WHERE
Number < 5
Rich
"Shark" <cp*******@yaho o.com> wrote in message
news:11******** *************@g 44g2000cwa.goog legroups.com... Hi, I'm looking for an efficient way to do the following:
"given a column of entries with double values, select the greatest
value less than D", where D is given as the upper bound.
so if I have 0.1, 1.4, 10.11, 5.5 etc. then for D = 5, i should get
1.4.
My current solution stores all entries in an array and sorts them...
which I know is very very very inefficient. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: zaceti |
last post by:
I'm new to MySQL and I am having a problem selecting the highest
valued date/time for a particular day. Here is the table structure:
+--------------+-----------------+-----+----+--------+--------------+
| Field | Type | Null| Key| Default|Extra |
+--------------+-----------------+-----+----+--------+--------------+
| id | int(10) unsigned| | PRI| NULL |auto_increment|
| timestamp | datetime ...
|
by: ckerns |
last post by:
I want to loop thru an array of controls,(39 of them...defaults = 0).
If value is null or non-numeric I want to assign the value of "0".
rowString = "L411" //conrol name
if (isNaN(eval ("document.forms."+rowString+".value")) == true )
{
//this alert works if the value is a letter,i.e,"a"
alert("You have entered an non-numeric value.\nEnter a number
in the appropriate box.");
|
by: dumbledad |
last post by:
Hi All,
I'm confused by how to replace a SELECT statement in a SQL statement
with a specific value. The table I'm working on is a list of words (a
column called "word") with an index int pointing to the sentence they
come from (a column called "regret"). I also have a table of stop words
(called "GenericStopWords") that contains the words I do not want to
consider. That table has a single column called "word".
I started off using a...
|
by: Mike Nolan |
last post by:
As far as I can tell, Postgres has no equivalent to greatest and least
functions in Oracle. Yes, you can do the same thing with a case statement,
but at the expense of writing MUCH longer SQL statements.
Is this something that is on or can be added to the 'to do' list?
I could write a series of user-defined functions to do specific
comparisons (such as comparing several dates and returning the greatest
one) but there doesn't appear to...
|
by: Mathew Butler |
last post by:
Suppose I have a table t with columns id, col1, col2, col3, col4, col5, col6 all numeric. I want to query the table and for each value of col<x> in the resultset I want to identify the largest value in each of the columns. For example, with the following dataset:
id, col1, col2, col3, col4, col5, col6
1,2,3,4,5,6,7
2,8,6,5,4,3,2
3,2,3,9,4,2,1
I want a query to generate the following output:
1,7
| | |
by: sdlt85 |
last post by:
Hi,
Can someone help me with an idea on how to start writing a C++ code
for generating
greatest common divisor and the linear combination of two intergers
represented as gcd(m, n)= mx + ny and adding them it will give us the
greatest common divisor and I need to use the extended Euclidean
algorithm.
I already have the code for the greatest common divisor but I dont
know how to do the linear combination.
This is what I have:
|
by: puneet28in |
last post by:
Hello,
I want to retrieve bounded textbox value of a form whenever user click on next record. I have used the textbox.value property but it always gives the old or the initial value.
Help me out
Puneet
|
by: stressedstudent |
last post by:
I dont know where I am going wrong so I dont know which part to post, this is what I have, can anyone help me figure out where I am going wrong? THanks for any and all help.
// into to c++
// This program should use a loop that lets the user enter a series of integers.
// The user should enter -99 to signal the end of the series.
// After all the numbers have been entered,
// the program should display the largest and smallest numbers...
|
by: agarwasa2008 |
last post by:
Hi,
I have a linked table called tbltest and some bounded forms (which
add, update, delete records) that were created using that linked
table. For some necessary reasons I had to create another linked table
called tblComponents and then I bounded the original forms to this new
table. I did change the
control source: Description (Field name)
RowSource Type: Table/Query (which remains the same)
|
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: 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...
|
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: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
| | |
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...
| |
