MongoDB Querying with Regular Expressions
Regular expressions provide a powerful method for matching text patterns within MongoDB documents. The $regex operator enables this functionality, utilizing the PCRE (Perl Compatible Regular Expressions) library.
Consider a blog_posts collection with the following document structure:
{
"content": "Explore the MongoDB tutorials ...
Posted on Sat, 19 Sep 2026 16:16:21 +0000 by meigwil
Fundamentals of MySQL Query Language
Introduction to SQL
SQL (Structured Query Language) is a standard language for managing relational databases. It enables operations such as data retrieval, insertion, modification, and deletion.
SQL Syntax Basics
SQL is case-insensitive for keywords. Semicolons are used to separate statements in many database systems.
Essential SQL Commands
...
Posted on Tue, 25 Aug 2026 16:33:22 +0000 by disconne
Advanced SQL Query Techniques: Data Retrieval and Manipulation
SELECT Statement Fundamentals
The SELECT statement is fundamental for retrieving data from databases. When used alone, it can access system parameters and configuration settings.
-- View system parameters
SELECT @@port;
SELECT @@basedir;
SELECT @@datadir;
SELECT @@socket;
SELECT @@server_id;
SELECT @@innodb_flush_log_at_trx_commit;
SHOW VARIABL ...
Posted on Thu, 13 Aug 2026 16:50:58 +0000 by REDFOXES06