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Murach's SQL Server 2019 for Developers Create an Entity Relationship diagram using Visio or visual-paradigm or Lucidchart or other sources. You will look at page 313 of your textbook and recreate the middle example that includes the Employees, Membership, and Committees tables.

Murach's SQL Server 2019 for Developers Create an Entity Relationship diagram using Visio or visual-paradigm or Lucidchart or other sources. You will look at page 313 of your textbook and recreate the middle example that includes the Employees, Membership, and Committees tables.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Murach's SQL Server 2019 for Developers Create an Entity Relationship diagram using Visio or visual-paradigm or Lucidchart or other sources. You will look at page 313 of your textbook and recreate the middle example that includes the Employees, Membership, and Committees tables.
● ● ● ● ● The relationships between the tables in the accounts payable system Vendors VendorID VendorName VendorAddress Vendor City Vendor State VendorZipCode VendorPhone Vendor ContactFName Vendor ContactLName Terms Account No Employees EmployeelD FirstName LastName Invoices InvoicelD VendorID EmployeelD CommitteelD Employees EmployeelDe FirstName LastName InvoiceNumber Invoice Date Invoice Total Two tables with a many-to-many relationship Memberships Payment Total CreditTotal Terms InvoiceDueDate Payment Date Account No Linking table Chapter 10 How to design a database Two tables with a one-to-one relationship Employee Photos EmployeelD EmployeePhoto InvoiceLineltems InvoicelD InvoiceSequence AccountNo Lineltem Description ItemQuantity Description Most tables should have a primary key that uniquely identifies each row. If necessary, you can use a composite key that uses two or more columns to uniquely identify each row. Item UnitPrice LineltemAmount Committees CommitteelD CommitteeName The values of the primary keys should seldom, if ever, change. The values should also be short and easy to enter correctly. If two tables have a many-to-many relationship, you'll need to define a linking table to relate them. Then, each of the tables in the many-to-many relationship will have a one-to-many relationship with the linking table. The linking table doesn't usually have a primary key. If two tables have a one-to-one relationship, they should be related by their primary keys. This type of relationship is typically used to improve performance. Then, columns with large amounts of data can be stored in a separate table. Figure 10-5 How to identify the primary and foreign keys If a suitable column doesn't exist, you can create an identity column that can be used as the primary key. If two tables have a one-to-many relationship, you may need to add a foreign key column to the table on the "many" side. The foreign key column must have the same data type as the primary key column it's related to. 313
Transcribed Image Text:● ● ● ● ● The relationships between the tables in the accounts payable system Vendors VendorID VendorName VendorAddress Vendor City Vendor State VendorZipCode VendorPhone Vendor ContactFName Vendor ContactLName Terms Account No Employees EmployeelD FirstName LastName Invoices InvoicelD VendorID EmployeelD CommitteelD Employees EmployeelDe FirstName LastName InvoiceNumber Invoice Date Invoice Total Two tables with a many-to-many relationship Memberships Payment Total CreditTotal Terms InvoiceDueDate Payment Date Account No Linking table Chapter 10 How to design a database Two tables with a one-to-one relationship Employee Photos EmployeelD EmployeePhoto InvoiceLineltems InvoicelD InvoiceSequence AccountNo Lineltem Description ItemQuantity Description Most tables should have a primary key that uniquely identifies each row. If necessary, you can use a composite key that uses two or more columns to uniquely identify each row. Item UnitPrice LineltemAmount Committees CommitteelD CommitteeName The values of the primary keys should seldom, if ever, change. The values should also be short and easy to enter correctly. If two tables have a many-to-many relationship, you'll need to define a linking table to relate them. Then, each of the tables in the many-to-many relationship will have a one-to-many relationship with the linking table. The linking table doesn't usually have a primary key. If two tables have a one-to-one relationship, they should be related by their primary keys. This type of relationship is typically used to improve performance. Then, columns with large amounts of data can be stored in a separate table. Figure 10-5 How to identify the primary and foreign keys If a suitable column doesn't exist, you can create an identity column that can be used as the primary key. If two tables have a one-to-many relationship, you may need to add a foreign key column to the table on the "many" side. The foreign key column must have the same data type as the primary key column it's related to. 313
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