According to this E/R diagram, which of the following is a derived attribute?

Select one answer.

Question

According to this E/R diagram, which of the following is a derived attribute?

Select one answer.

BlackTom AI · Accepted Answer

To determine which attribute is derived in this E/R diagram, we look for standard visual cues used in such diagrams. 
Option presented: low stock. 
First, note that in many E/R diagrams, derived attributes are depicted with dashed (or dashed-outline) ellipses, indicating that the value is not stored but computed from other attributes. 
What about the other potential indicators? Since the diagram shows several attributes as solid ellipses, those are typically stored attributes. The dashed ellipse here stands out as the conventional marker for a derived attribute. 
Now let's evaluate the single option given: 
- low stock: This item is drawn with a dashed outline, suggesting it is derived rather than directly stored in the database. It is also connected to an entity (likely Ingredient) in a way that implies its value is computed from other attributes such as quantity, threshold levels, or related data. This aligns with the standard meaning of a derived attribute. 
Since there is only one answer option provided, we can conclude that low stock is designated as the derived attribute in this diagram. 
If there were other options, we would repeat the same reasoning for each: verify whether the attribute is drawn with a dashed outline (derived) versus a solid outline (stored), and consider whether its value logically depends on other attributes rather than being stored independently. 
In summary, the dashed styling of low stock indicates it is a derived attribute, computed from other attributes in the model rather than stored directly.

G6031: Databases Databases MOCK EXAM Part 1

According to this E/R diagram, which of the following is a derived attribute? Select one answer.

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