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Database consultancy: Hierarchy in MS SQL Server

In our time of greatest prevalence of databases were relational databases, which are the main targets of the tables and the relationships between them. Tables can solve most problems for data storage and manipulation. But in the real world entity requiring storage is not always presented in a tabular form. One of these very common types of data structures other than the table is a tree structure, where each data element is the parent and the offspring. An example of such a structure may be the structure of state enterprises, which is headed by the director (the root of the tree), his deputies, heads of departments from which are subject to certain deputies, employees of departments, which are subject to the rulers.

Forrards
March 31, 2023
Database consultancy: Reports generator for MySQL

No matter how much you've worked with MySQL, from time to time a modern and reliable report generator is needed. The up to date reports generator should have the following capabilities:

Forrards
March 31, 2023
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Database consultancy: Writing to data files

It is a very popular database development task of loading data from the database to files directly. But how does it happen? Is it implemented immediately or the data is stored in memory first and transited to files later? Which event causes data transfer to transactions registration table and to files? Let’s see how it goes.

Forrards
March 31, 2023
Database consultancy: CROSS APPLY

This article is dedicated to the operator APPLY, and more specifically its type CROSS APPLY. This statement was first introduced in SQL Server 2005, but unfortunately many have not learned how to use it, maybe it's because of the fact that the BOL (SQL ServerBooksOnline) this operator is not well and has a very "dry" examples of its use. In this article, I'll show some interesting demonstrations, where the operator can come in handy.

Forrards
March 31, 2023

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