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工作学习 / IT技术讨论 / 请教：在database management system中， Conceptual Schema, Physical Schema, External Schema到底是什么东西？干什么用？谢谢先我只知道写SQL Script 建数据库，建表，建索引，但这些概念性的东西不懂。请前辈们帮忙解释一下。非常感谢
-boer_ioi(我到了爱城);
2005-2-26
{99}
(#2146914@0)
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Why not google these concepts? They are easy to be found
-handd(大熊猫®);
2005-2-26
(#2148107@0)