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erd diagram

S

s.n.a.g

Guest
#1
anyone here familiar with erd diagram?

i would like to know what is the meaning of these err... symbols

== , -- and o

thz in advance ;)
 

Khayman

I'm sorry Hal...
Political User
#2
They appear to be the Information Engineering notation for expressing, one and only one, one and zero

unless i've got the completely wrong end of the stick! :)
 

Khayman

I'm sorry Hal...
Political User
#5
like i said
= one and only one
- one
o zero

although it doesn't quite work out of context of the diagram

this might help
 

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