有关应该单独存放项的情况,请参阅 "ASA SQL 用户指南 > 设计数据库 "。多对一关系、多对一关系成为表间的外键关系。 Through founds the relations in the database, may compile uses in the management list the data rule or the convention code.After relates sets at into the database structure, ...
This design is what is delivered to the business community, along with the business rules, user documentation and so forth, in the form of that graphical Entity Relationship Diagram. That serves as a discussion vehicle, something that has simple symbols and text to rapidly convey what information...
This will set up a master-detail relationship between thevoDeptand thevoEmp. Creating View Links from an Entity Association Use thecreateViewLinkFromEntityAssocNamemethod to create a View Link when your code can access the View Objects and an Entity Association. This method can create a View L...
An entity class named Customer is created. It has properties that correspond to the columns in the Customers table. Drag Orders from Database Explorer onto the O/R Designer surface. An entity class named Order is created that has an association (relationship) to the Customer entity class. It...
Here's what the Entity Relationship Diagram (ERD) will look like for our database: Let's set up our database to get started. Setting Up the Database In your terminal, create thepets_database.dbfile by running the following command: ...
In such a case, you can override the SDK per storage server, by uploading an SDK and using it only for this particular storage server. To override the existing SDK for a storage server, upload the tar file to the Software Library entity. The tar file should have the structure as ...
Creating a custom or hang-off entity enables you to: Create a relationship between a standard table and a hang-off table. Invoke Extensible APIs that store and retrieve data from hang-off tables. Invoke dbverify for generating appropriate SQL scripts to create or alter tables for custom or han...
• In different digitalization stages, models are divided into three categories: 1) Entity relationship models meet the requirements to implement the business logic for Online Transaction Processing (OLTP). Advanced 11 Features frameworks must also include behavioral entities as a part of the model...
When a primary key of the principal entity is part of the primary key of the dependent entity, then deleting the principal object also deletes all the loaded dependent objects. This is the same as defining the cascading delete rules on the relationship. ...
Take special note of the capitalization used in the example above. It's common practice among SQL programmers to use all capital letters for SQL keywords such as "CREATE" and "DATABASE" while using all lowercase letters for user-defined names like the "personnel" database name. These conventi...