A relationship with one-to-many cardinality represents a link between two entities A and B, where one instance of the A entity refers to many instances of the B entity.
In software engineering, you can use various diagramming notations to describe and understand the designed solution from different perspectives. The diagrams can be used as a design tool and later as a part of the documentation.
UML is an acronym for unified modeling language. UML is designed as a general-purpose notation. The best application for UML is in the field of software engineering. It allows you to design software architecture, processes, and communication between services and system parts. UML models are visualized in the form of various diagrams.
A use case analysis allows you to understand the functional user requirements on the modeled system. During the analysis, you will identify the actors and specify their interactions with the system using use cases. Use cases are detailed using a flow of events.
If you want to design a data model for your database, you should use an entity-relationship diagram (also known by ERD acronym). It may be used for conceptual, logical, and also physical data models. Alternatively, you may also use a UML class diagram for the same purpose.
Regular expressions can be transformed into a state machine diagram. It is possible to map regex syntax to states and transitions.
There are multiple options on how to join rows of two entities into a single result set. It depends on whether you want to have all data from the left entity or right entity, both entities, or you would like to get the data that are present in both entities.
UML is used for designing of various software aspects. It provides a notation for structure and behavior modeling. There are 7 structure diagrams and 7 behavior diagrams.
Software development is a complicated process because it produces complicated things that should look very simple. A lot of disasters and mistakes may occur during it. Check this list to avoid common complications in your software projects.
Some modules and concepts are needed in almost every software. This article lists the most common ones.