I am looking for software which can draw the ER diagrams and some UML modelling as well.

I am using windows 7 as operating system.

I don't have any database design yet i only want to draw diagram on paper so that i can show my friends

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I've used mysql workbench, which is a bit of a memory hog, but useful when you have an existing db that you need to diagram. – slotishtype Jun 18 '11 at 10:10
See also this question, which asks the same: superuser.com/questions/69852/… – Linker3000 Jun 18 '11 at 12:27
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up vote 2 down vote accepted

Gliffy is a free online service you can use to draw some UML diagrams. I found it useful for sequence diagrams.

example ERD

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Can it draw ER diagram as well – Moorage Jun 18 '11 at 10:50
I have updated my answer to include an ERD from Gliffy – RedGrittyBrick Jun 18 '11 at 11:04
thanks for that – Moorage Jun 18 '11 at 12:18
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