GROUP BY is a command in the SQL relational database standard for collapsing a group of rows that share common field value(s) into a single row. Aggregate functions can be performed on other fields in the group, such as SUM() or AVG(), to collate related data into a single value.

Reflection is the ability of a program to observe and/or modify its structure and/or behavior at runtime. Reflection is dependent on the supporting programming language - please tag the programming language being used when using this tag.

Hypertext Transfer Protocol Secure (HTTPS) is a combination of the Hypertext Transfer Protocol with the SSL/TLS protocol to provide encrypted communication and secure identification of a network web server.

Apache Flex [NOT CSS FLEXBOX] is a framework for developing Rich Internet Applications that run in Flash Player or Adobe Air. Originally designed by Adobe, Flex was donated to the Apache Software Foundation in 2011 and became a top level Apache project in December 2012.

A series of activities that makes a program available for use (usually in test or production environments)

NetBeans refers to both a platform framework for Java desktop applications, and an integrated development environment (IDE) for developing with Java and other languages.

A makefile is an input file for the build control language/tool make. It specifies targets and dependencies along with associated commands to perform (a.k.a. recipes) to update the targets.

Ember.js is a component-service application framework written in JavaScript. Consider making your question easier to answer by using the preconfigured templates mentioned in this tag's wiki. (Always specify version of ember used when describing your issue)

PDO (PHP Data Objects) is a data-access abstraction layer (interface) for PHP. It works with most database systems.

This covers the asynchronous programming model supported by various programming languages, using the async and await keywords.

Database design is the process of specifying the structure and thus the logical aspects of a database. The goal of database design is to make a representation of some "universe of discourse" - the types of facts, business rules and other requirements that the database is intended to model.