When comparing Socrates vs SQLGate, the Slant community recommends SQLGate for most people. In the question“What are the best database design programs?” SQLGate is ranked 2nd while Socrates is ranked 16th. The most important reason people chose SQLGate is:
Functions; filter, sort and group on grid / Copy, past, sum and statistics functions like excel.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Parses an uploaded sql file to generate information about tables, fields and primary keys
(current 750K Max filesize)
Pro Quick data analysis
Functions; filter, sort and group on grid / Copy, past, sum and statistics functions like excel.
Pro Saves time with autocomplete & template functions
Pro Fast processing and easy customization
They put out weekly updates, so there are new and impressive functions being added pretty consistently.
Pro Supports cloud-based DB such as AWS & Azure
Pro Includes PL/SQL editor and debugger
Pro ER diagrams
Entity Relationship database diagrams limitations are: only supports reverse engineering, and can not export to formats other than .erd
Cons

Con Screenshots require a browser plugin
ones that support full-page screenshots (that go beyond the browser viewport when grabbing an image of the page), as this visualizer does not generate the images itself
Con Logon
The logon process after starting up the application is rather long winded (tested with PostgreSQL, no defaults shown for e.g. port number).
Con Free version is limited
e.g. only 10 tables allowed in ERD designer.
