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This week we will see the techniques used to structure the data requirements for an information system application as the textbook and lecture notes emphasizes entity-relationship (E-R) diagramming, the most common notation used by practicing systems and data analysts. You will see how E-R diagramming is used along with process and logic modeling techniques to develop a thorough, unambiguous description of system requirements. In addition to the standard constructs of the E-R model (entities, attributes, and relationships), the data-oriented questions that should be raised during requirements determination will be discussed in our online discussions. In essence, the Conceptual Modeling process looks at how the data is structured and what the characteristics of the data are. What characteristics of data are represented in an E-R diagram?
metropolis toys is an independent family-owned manufacturer of wooden toys. the toys are designed by members of the
Based on the schema write SQL statements and provide the equivalent relational algebra expressions - relational algebra expressions return and give the equivalent SQL statements.
problem 1suppose you have a relation schema about teaching classes that has the following attributes class instructor
Create a data dictionary that includes the following: A description of the content for each field, The data type of each field, The format the data will be stored as in the field
Give a practical example when you would move an attribute to another entity type. Describe in detail.
1. which is not a factor to consider in software evaluation?a. performance effectivenessb. performance efficiencyc.
Display the item id and the difference between the default price and cost (ITECH5006 - together with a percentage markup) of all products.
Select database management system (Oracle, SQL Server, MYSQL, etc) and identify the data types and sizes for all attributes
Demonstrate the basic mechanisms for accessing relational databases from various types of application development environments.
Give at least three reasons why ETL functions are most challenging in a data warehouse environment.
Draw the corresponding GRD, exhibiting all the primary keys and foreign keys. For simplicity, no other attributes nor multiplicity constraints are required.
The following assignment is based on the database environment chosen and discussed in the Week Two Individual Assignment. Use a Microsoft Visio diagram to create a detailed ERD using the data specificationsnoted in the Week Two Individual Assignmen..
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