C Zone

    Programming ZONE

  • C

 
Article Author
Written by John Humphreys

C++ Threading and the POSIX Library

This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.
Before we start, I want to say that every time I show source code, it is tested. And for every modification, I will provide the complete code in so you can just copy paste and try it out yourself. This means some parts of the code examples are repeated... but it's that way just for your convenience! I didn’t put my output in here, but you shouldn't need it -- ...
Article Author
This is basically a blog post I wrote recently. I've found that SARGability is poorly understood, and since many people don't read blogs, I figured I'd post it here as an article.

SARGable is an adjective in SQL that means that an item can be found using an index (assuming one exists). Understanding SARGability can really impact your ability to have well-performing queries.

Incidentally – SARGable is short for Search ARGument Able.
...
Article Author
by Patrick G. Matthews

Introduction

Like other database applications, Access provides support for computing basic descriptive statistics for a data set, offering such aggregate functions as Count, Sum, Min, Max, standard deviation and variance (StDev, StDevP, Var, and VarP), and average (Avg). In addition to these typical aggregate functions, Access also offers the so-called "domain aggregate" counterparts for each of the aggregates already mentioned.

...
Article Author
by Patrick G. Matthews



All major SQL dialects allow for a Count aggregate function, and Access's native Jet SQL is no exception. As in other database platforms, Access's Count() (as well as the "domain aggregate" DCount()) function returns the number of records pertaining to a grouped result set and meeting the criteria specified in the query (in the case of Count()) or in DCount() in the third argument of the function.

...
 
 
Must Read
Today | All Time
View All
 
 
Zone Advisors

Having problems asking a question? Have a general question about Experts Exchange? Let us know!

 
 
Experts Exchange Mobile

Visit Experts Exchange from your mobile device to search, ask, and monitor your questions. Never lose touch again.

Preview From Your Desktop
 
 
[x]
Neglected Question
Neglected questions are any questions that either have not yet been addressed by an expert, or a solution has not been awarded, and may be eligible for bonus points (see your profile page for details).
Date Points Title Comments
1
 03/12/10 07:48 AM 500 Serial Port Reading/Writing with Cygwin 0
2
 03/11/10 09:47 PM 500 establish connection with database 1
3
 03/11/10 09:45 PM 500 simple program connect from client with server 3
4
 03/11/10 07:05 AM 500 auto focus algorithms? 1
5
 03/11/10 06:35 AM 500 Trace into the "Out of memory" problem. 3
6
 03/10/10 04:29 PM 500 problem with arm compilation 3
7
 03/10/10 02:19 PM 500 Differences between CCITT G4 compression and IBM MMR 8
8
 03/10/10 12:20 PM 500 implementing code for a solution (tricky) 7
9
 03/09/10 07:17 PM 500 Need a P-Matrix and U*-Matrix functions to visualize Clusters in high dimensio… 5
10
 03/09/10 05:02 PM 500 MICROSOFT VISUAL C + + Runtime Library - How to stop this message from … 7
View More Questions Awaiting Answers
 
 
 
Loading Advertisement...
ADVERTISEMENT