## Data hierarchy

Data in HWN is stored hierarchically, with the hospital at the top and patient data at the bottom. The definition of data at any level depends on the earlier creation of data for the level immediately above.

Figure 2: Data hierarchy

One consequence of this data hierarchy is that if you delete a definition at one level you automatically delete the data that depend on that definition, at the lower levels. For example, if you delete a ward definition (W2), all the data belonging to patients on that ward are also deleted (Figure 4). Furthermore, if you delete the whole hospital record, you would delete all the related ward and patient data as well.

HWN warns you before it deletes anything, but you need to be vigilant to ensure that you do not lose your work or that of others.

Figure 3: Data hierarchy – warning message

Figure 4: Data hierarchy – the effect of deleting a ward definition

More:

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HelicsWin.Net v2.2 Online User Guide v20160330
© European Centre for Disease Prevention and Control, 2016
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