If you are looking for a free open source tool for this, you can try:
DBDesigner
From the website:
DBDesigner 4 is a visual database design system that integrates database design, modeling, creation and maintenance into a single seamless environment.
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DBDesigner 4 , Oracle Designer ©, IBM Rational Rose ©, Computer Associates ERwin © Kompany DataArchitect ©, , Microsoft Windows © 2k/XP Linux KDE/Gnome. GPL.
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- SQL Query Builder
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