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2009年9月24日

What are the difference between DDL, DML and DCL commands[转]

摘要： What are the difference between DDL, DML and DCL commands? Submitted by admin on Wed, 2004-08-04 13:49 DDLData Definition Language (DDL) statements are used to define the database structure or schema... 阅读全文

posted @ 2009-09-24 11:18 龙泰 阅读(294) 评论(0) 推荐(0) 编辑

Why do some SQL strings have an 'N' prefix? [转]

摘要： You may have seen Transact-SQL code that passes strings around using an N prefix. This denotes that the subsequent string is in Unicode (the N actually stands for National language character set). Whi... 阅读全文

posted @ 2009-09-24 10:18 龙泰 阅读(587) 评论(0) 推荐(0) 编辑