Stephen Ince wrote on 27.08.2007 18:02:
Derby and hsqldb are the only free embedded databases for commercial use.

Well, there are some more:
H2 Database, OneDollarDB (OpenSource version of DaffodilDB), Berkely DB and McKoi are free as well (although McKoi seems to be dead).

Then there are a couple of other Java based engines (SmallSQL, TinySQL, Axioin) but they do not compare feature-wise to the "big names".

And of course Firebird is free for commercial use as well.

Thomas


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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not
      match

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