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Explain the three different sets of terms used to describe tables, columns, and rows. In the field of database design and management, different terms may point to a single term. Same is the case with the data table and its …
Explain the three different sets of terms used to describe tables, columns, and rows. Read more »
Must all the values in the same column of a relation have the same length? It is not necessary for a column in a table to hold the same length data. Though it is mandatory that all the cells of …
Must all the values in the same column of a relation have the same length? Read more »
Suppose that two columns in two different tables have the same column name. What convention is used to give each a unique name? To name two columns in two different table with uniquely when they happen to have the same …
Describe and provide an example of an entity-relationship (E-R) diagram. E-R diagrams are used to show relationships between the data in two different tables. The relationship is established with the help of foreign-key. The foreign key is the name …
Describe and provide an example of an entity-relationship (E-R) diagram. Read more »
Design an updateable database to store data received from another source. SQL has the capacity to collect data sent to it from the outside sources and store it in its tables. As can be seen in Figure 1 that …
Design an updateable database to store data received from another source. Read more »
Describe and explain how to identify functional dependencies, identify determinants and dependent attributes in a database. Functional dependencies are used in databases to define relationships and dependencies of different attributes on each other. There may or may not be a …
List four common design problems when creating databases from existing data. Creating databases from already existing data may have all or some of the following issues. There are issues of having multiple attributes. The structure of database may not be …
List four common design problems when creating databases from existing data. Read more »
Summarize how database design principles differ with regards to the design of updateable databases and the design of read-only databases. The very nature of updatable and read-only database is different. Updatable databases are accessed by user and amended while read-only …
When you receive a set of tables, what steps should you take to assess their structure and content? In database management and development it is important to properly assess data in data tables in respect to their structure and content. …
Under what conditions will a determinant be unique in a relation? In a relation a determinant is unique when it determines the data that is consisted in all other columns. ID is an example of a unique determinant. For example …
Under what conditions will a determinant be unique in a relation? Read more »