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how to represent a foreign key in erd

 
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can anyone tell me how to represent a foreign key in erd?
is there any site or tutorials?
 
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Eclipse IDE VI Editor Java
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I googled quickly and found this tutorial. The second line of the first image shows you what to do.
 
Do the next thing next. That’s a pretty good rule. Read the tiny ad, that’s a pretty good rule, too.
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