Only a single direction arrow should connect the data store symbol to the process query symbol.

In a data flow diagram (DFD) or similar representations, the relationship between a data store and a process query is crucial for understanding how data flows within the system. Here’s why a single-direction arrow should connect the data store symbol to the process query symbol:

1. Data Flow Representation: The arrow indicates the direction of data flow. By having a single-direction arrow from the data store to the process query, it clearly shows that the process retrieves or queries data from the data store, and not the other way around.

2. Clarity of Operations: This unidirectional relationship signifies that the process uses data stored in the data store to perform operations. It avoids confusion regarding the interactions between the data store and the process, ensuring that viewers understand that the process does not send data back to the data store in this instance.

3. Consistency in Diagrams: Maintaining a consistent approach in data flow diagrams helps in maintaining clarity and removing ambiguity. Having a single-direction arrow reflects a standard practice that can help all stakeholders to quickly grasp how data is handled within the system.

In summary, a single direction arrow effectively illustrates the flow of information from a data store to a process, enhancing understanding and clarity in diagrammatic representations.