SQL Lite

SQL Lite
SQLite is a small C library that implements a self-contained, embeddable, zero-configuration SQL database engine.
It is a open source product and can be downloaded from http://www.sqlite.org/ . SQL Lite is best suited in Smart Client architecture, where we can locally store all our data in SQL Lite and then synchronize the local data with main database.
 
There is aslo a good Query analyzer clone at http://www.monkeyshinez.net/SQLiteQA/ 
 
 
 
An ADO.net Provider for SQLLite is available at http://sourceforge.net/projects/adodotnetsqlite/
 
SQL LiteÏÂÔØ£¨Precompiled Binaries For Windows£©£ºhttp://www.sqlite.org/sqlite-3_6_22.zip£¬
http://www.sqlite.org/download.html