Teach yourself Delphi 4 in 21 days 并列题名：Teach yourself Delphi 4 in 21 days Teach Yourself Java 2 in 21 Days Teach youeself Visual Basic 4 in 21 days Teach Yourself C++ in 21 Days Teach Yourself PL/SQL in 21 Days Teach Yourself TCP/IP in 14 days Sams teach yourself Java in 21 days 书名原文:Teach youeself Visual Basic 4 in 21 days Sams teach yourself SQL in 21 days