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$0

GPL v2

SQL Compare SQL Database Management System

Bitmap

Hash

Cursor
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None

Except
Inner Joins
Inner Selects
Intersect
Merge Joins
Outer Joins
Union

ACID Compare Database Management System with ACIDUnicode Compare Database Management System with Unicode

FAQ
Mailing List

LucidDB (luciddb.org)

Relational Model

Windows Compare Windows Database Management System

$361

Proprietary

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Multi-Core Support
Multiple Data Access Command Sets
Multiple Threads
Network Protocols Supported
Referential Integrity
SQL Interpreter
Transactions
Unicode
Very small and Fast

Blog
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Online self serve
Owner`s/User Manual
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Nexusdb (nexusdb.com)