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With the DIA chart program, how to add power notation in relationship lines?

I am using DIA v0.97.1 to draw an entity relationship diagram with a UML sheet for my database model. However, I tried and could not find a switch that allows adding notes about power (for example, 1 ... n) to these relationship lines. Is there such a feature in Dia? Or do I need to install some plugins? Thanks.

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the power of relations is established inside the relations field. double-click it to find its properties. the first three properties are the name, the left power, and the right power :) so they remain locked in the relationship field, and not in the row. which actually makes more sense.

also make sure that you are using the model sheet "er" and not "uml", since there is no relationship window in the "uml" sheet. "er" has only 5 pieces, but in fact they are all needed for er charts.

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Source: https://habr.com/ru/post/1390736/

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