E M P2
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This document discusses database tables and joins. It contains two tables, one with employee last names and department IDs and another with department names and IDs. It performs an inner join on the tables to match employees to their departments by ID. It also shows the results of a cross join, which pairs every record in one table with every record in the other table.
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E M P2
- 1. Conception Avancée de Base de Données Exemple canonique : Employés Services
- 2. Deux Tables 31 Jasper 34 Smith 34 Robinson 33 Steinberg 33 Jones 31 Rafferty DepartmentID LastName Marketing 35 Clerical 34 Engineering 33 Sales 31 DepartmentName DepartmentID
- 3. join SELECT Employee.LastName,Department.DepartmentName FROM employee, department WHERE employee.DepartmentID = department.DepartmentID Sales Rafferty Engineering Steinberg Clerical Smith Engineering Jones Clerical Robinson Department.DepartmentName Employee.LastName
- 4. cross join, cartesian join, product SELECT * FROM employee, department;
- 5. 35 Marketing 31 Jasper 35 Marketing 34 Robinson 35 Marketing 34 Smith 35 Marketing 33 Steinberg 35 Marketing 33 Jones 35 Marketing 31 Rafferty 34 Clerical 31 Jasper 34 Clerical 34 Robinson 34 Clerical 34 Smith 34 Clerical 33 Steinberg 34 Clerical 33 Jones 34 Clerical 31 Rafferty 33 Engineering 31 Jasper 33 Engineering 34 Robinson 33 Engineering 34 Smith 33 Engineering 33 Steinberg 33 Engineering 33 Jones 33 Engineering 31 Rafferty 31 Sales 31 Jasper 31 Sales 34 Robinson 31 Sales 34 Smith 31 Sales 33 Steinberg 31 Sales 33 Jones 31 Sales 31 Rafferty Department.DepartmentID Department.DepartmentName Employee.DepartmentID Employee.LastName