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--构造原始数据CREATE TABLE #T(N VARCHAR(10))--插入数据INSERT INTO #T (N)VALUES ('A')--方式一:一句话删除重复数据(无主键) DELETE t FROM (SELECT *, ROW_NUMBER() OVER(ORDER BY N... 阅读全文
摘要:
Chapter1.Introduction章节一、引言1.1.Overview概述When developing robust .NET connected applications, it is often a good idea to isolate the specifics of your persistence implementation behind a common API. Data Access Objects allow you to create simple components that provide access to your data without rev 阅读全文