What is the definition of optional to many in entity relationship diagram?
Answers
An entity relationship diagram (ERD) shows the relationships of entity sets stored in a database. An entity in this context is a component of data. In other words, ER diagrams illustrate the logical structure of databases.
At first glance an entity relationship diagram looks very much like a flowchart. It is the specialized symbols, and the meanings of those symbols, that make it unique.
There are many tools which can help you design ER diagrams such as:
ER/Studio
ER/Studio is an intuitive data modelling tool that supports single and multi-platform environments, with native integration for big data platforms such as – MongoDB and Hadoop Hive. It can forward and reverse engineer models, includes a compare and merge function and is able to create reports in various formats (XML, PNG, JPEG). Built-in features automate routine tasks and supports the popular database platforms. ER/Studio is a great tool that that is easy to start working with due to its intuitive design and good user support.
SqlDBM initially started out with inbuilt support for Microsoft’s SQL Server only.
But of course, due to large number of requests for MySQL support from our users, we have been working hard to expand our product.
And now, we are very proud to announce that SqlDBM offers support for MySQL – one of the most popular open-source databases in the world.
Create database objects like tables, objects, relationships, indexes, quickly and intuitively
Alter and edit database objects inline in your diagram
Copy or Move columns across tables
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