When retrieving data from a database, you may need to refer to more than one table at a time. In Structured Query Language (SQL), you can use the `UNION` operation, which takes the results of two queries with matching columns and merges them into one. In this guide, you will use `UNION` operations to retrieve data from more than one table simultaneously and combine the results. You will also combine the `UNION` operator with filtering to order the results.
Learn how to use systemctl to manage systemd services and units in Linux. Control startup, shutdown, and more. Follow this step-by-step guide.
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: OpenBSD 7.6 📖 ~4 min read • Source: OpenBSD 7.6 errata 010_expat Errata topic: Security: expat (All architectures) Issued: March 18, 2025 Related CVEs: CVE-2024-8176 Upstream summary: In libexpat fix crash caused by stack overflow during recursion. CVE-2024-8176 Table of contents Symptom […]
When problems arise, sending alerts to the appropriate team significantly speeds up identifying the root cause of an issue, allowing teams to resolve incidents quickly. Prometheus is an open-source monitoring system that collects metrics from…
How to Set Up Windows Server Failover Cluster (WSFC) with SQL Server on Windows Server 2016 A Windows Server Failover Cluster (WSFC) forms the foundation for SQL Server high availability solutions including SQL Server Failover Cluster Instances (FCI) and Always On Availability Groups. An FCI presents a single SQL Server instance that is hosted on […]
MySQL is an open-source database management system, commonly installed as part of the popular LAMP (Linux, Apache, MySQL, PHP/Python/Perl) stack. It uses a relational database and SQL (Structured Query Language) to manage its data. This tutorial will explain how to install MySQL version 5.7 on an Ubuntu 18.04 server.
🟠 High ⏱ 15–60 min Last verified: 14 September 2019 Affected versions: FreeBSD 12 📖 ~4 min read • Source: FreeBSD VuXML VuXML topic: qemu — denial of service vulnerability Related CVEs: CVE-2015-1779 CVE-2015-3209 CVE-2015-3214 CVE-2015-3456 CVE-2015-5154 CVE-2015-5158 CVE-2015-5165 CVE-2015-5166 +12 more Upstream summary: Daniel P. Berrange reports: The VNC server websockets decoder will […]
🔴 Critical ⏱ 15–90 min Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read • Source: SUSE security advisory Related CVEs: CVE-2018-11307 CVE-2018-14718 CVE-2018-14721 CVE-2018-19360 CVE-2018-19361 CVE-2019-14379 CVE-2019-14893 CVE-2019-16942 +12 more Upstream summary: An issue was discovered in FasterXML jackson-databind 2.0.0 through 2.9.5. Use of Jackson default typing along with […]
F# is a concise, open-source, functional programming language initially developed at Microsoft Research to extend .NET, Microsoft’s set of tools, libraries, and languages to build applications and services. In this tutorial, we will set up an F# programming environment on Ubuntu 18.04 using both .NET Core and Mono runtimes. We will then write some code examples to test and review build and compile methods.
Enquanto muitos usuários precisam da funcionalidade de um sistema de gerenciamento de banco de dados como o MySQL, eles podem não se sentir confortáveis interagindo com o sistema unicamente a partir do prompt do MySQL. O phpMyAdmin foi criado para que os usuários possam…
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