Data Modeler
A tool for creating data models and databases for Microsoft SQL Server
... is an indispensable tool in any DBAs toolbox.
I've used a lot of data modelers, from open-source free software to expensive modelers like Embarcadero ER/Studio. None of them come close for me in terms of ease-of-use and productivity gains.
select * from DataModelers where Indispensable='true';
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