How you link the tables together will depend on their particular relationship to each other. You'll also want to rename tables to reflect that the films table only contains films and actors only stores actor information. We should also give it an ID PK field that will link to the same (new FK) field in the original table. To separate actors from films, we need to add a new table to host the actor attributes. Here is a model showing the existing films_and_actors table: Other features include import from ODBC data sources, generate complex SQL/DDL, and print models to files.
![navicat data modeler logical to physical navicat data modeler logical to physical](https://datatechnologytoday.files.wordpress.com/2018/10/fig2.jpg)
The Data Modeler also works in reverse, performing reverse engineering from existing databases. From there, you can generate database structures from a model.
![navicat data modeler logical to physical navicat data modeler logical to physical](https://imgs.developpaper.com/imgs/2020010821385259.jpg)
It helps you visually design high-quality conceptual, logical and physical data models. Navicat Premium comes with a built-in Data Modeler. Since we've already identified the repeating groups, let's re-design the table so that repeating group fields are omitted and given their own table. The original primary key will not now be unique so assign a new primary key to the relation using the original primary key as part of a composite key.Remove the the repeating group fields to a new table, leaving a copy of the primary key with the table that is left.Fixing Repeating GroupsĮven though repeating groups are not, strictly speaking, a violation of first normal form (1NF), the process of converting your data from Un-Normalized Form (UNF) to 1NF will eliminate repeating groups. The problem is that an actor is a separate and distinct entity from a film. Worse still, actors' names are repeated every time that they come up. You can see that each actor is adding an extra row to the table. Here is a sampling of rows from that table: Although its tables have been normalized to Third Normal form (3NF), for the purposes of this tutorial, we'll consider that the film table contains data about actors who appear in each film.
![navicat data modeler logical to physical navicat data modeler logical to physical](https://i-loadzone.com/wp-content/uploads/2020/12/a337q-ezkk4.png)
The Sakila sample database contains a number of database entities relating to a fictional video rental store. Since repeating groups are a phenomenon that can affect any relational database, we'll use Navicat Premium as our database development tool.
#Navicat data modeler logical to physical how to
In today's blog, we'll learn how to identify repeating groups both during design time and in existing databases, as well as how to fix them. The problem of repeating groups can be manageable in small organizations, but for larger organizations, whom must manage huge volumes of information, repeating groups can become a nightmare to deal with. Moreover, all of this repeating data can eat up a lot of valuable disk space and take a long of time to search through. For example, the same set of information being present in different areas can cause data redundancy and data inconsistency. It is a common problem faced by organizations both large and small, one that can have several ramifications.
#Navicat data modeler logical to physical series
Eliminating Repeating Groups In Your Database Tables by Robert GravelleĪ repeating group is a series of fields/attributes that are repeated throughout a database table.