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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 -- ...
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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.
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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.

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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.

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