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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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How to convert to Base64 and backwards via T-SQL

I want to share my way to convert a string to Base64 and back. Let me note that presented method is not the fastest, but it has one important advantage - it works OOB, without CLR functions. We need a test database and a table to use as an example:

Forrards
March 18, 2023
Performance and using of VARCHAR boxes as filters in SSRS reports

Very few people have thought about this performance killer. It is all about report parameter of text type.The initial situationThere was a table with about 45 million rows. Some columns in the table were VARCHAR and should have been filtered. As a result of filtering by 10 different parameters the total number of rows could have been significantly reduced. SQL Server was going for table scan in this case. Also there was a number of indexes defined on the table.

Forrards
March 18, 2023

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