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The line between collecitons is a virutal relation, meaning the ref field is poiting to the master collection. DbSchema is an SQLite GUI tool featuring interactive diagrams for designing SQLite databases in a team, schema deployment on multiple databases, edit and execute database queries, generate data, reports, data analysis, and more. Refresh the schema as in the chapters before to get the collection into the diagram. You can copy-paste this in DbSchema and execute it. The next collection slave has a field ref as the _id of one of the master documents.
Online tools to generate dbschema code#
Here is a JSON document: () This code is creating a collection master with name and position.
Online tools to generate dbschema generator#
Now you begin to create a QR Code or Barcode Free Online Barcode Generator to make your own Barcode. Some of the features offered by the tool are interactive layouts, relational data. Online QR Code Barcode Generator is a free, online, real-time to generate QR Code Barcode. DbSchema works with any SQL, NoSQL & Cloud database including Vertica.
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For detailed instructions please read the DbSchema SQL tutorial from To list the hobbies for each person we have to execute:ģ SELECT p.firstname, p.lastname, ph.hours_per_week, h.hobbyname FROM sample2.persons p INNER JOIN sample2.person_hobbies ph ON (p.personid = ph.personid) INNER JOIN sample2.hobbies h ON (ph.hobbyid = h.hobbyid) And the result: In MongoDb the data can have a hierarchical structure, called JSON. Free Online QR Code Generator to make your own QR Codes. You can execute the script above in DbSchema SQL Editor, refresh the schema and get the diagram bellow. In our case we have created three tables: one for persons, one for hobbies and one which stores each person hobby. Each table has a predefined structure as part of the schema. In MySql we will execute CREATE TABLE PERSONS( personid integer primary key, firstname varchar(100), lastname varchar(200) ) CREATE TABLE HOBBIES( hobbyid integer primary key, hobbyname varchar(100) ) CREATE TABLE PERSON_HOBBIES( personid integer not null, hobbyid integer not null, hours_per_week integer, constraint fk1 foreign key( personid ) references persons(personid), constraint fk2 foreign key( hobbyid ) references hobbies(hobbyid) ) Insert into persons (personid, firstname, lastname) values (1,'John', 'Steven') Insert into hobbies (hobbyid, hobbyname) values (1, 'Tennis') Insert into hobbies (hobbyid, hobbyname) values (2, 'Swimming') Insert into person_hobbies (personid, hobbyid, hours_per_week) values (1,1,5 ) Insert into person_hobbies (personid, hobbyid, hours_per_week) values (1,2,3 ) SQL databases are table-oriented. We will store in MySql and MongoDb a list of persons with their hobbies. 2 MySql vs MongoDb I will explain the difference between SQL databases and NoSQL with a practical example.