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第03章_基本的SELECT语句.md
SQL(Structured Query Language,结构化查询语言)是使用关系模型的数据库应用语言, 与数据直接打交道,由 IBM 上世纪70年代开发出来。 后由美国国家标准局(ANSI)开始着手制定SQL标准,先后有 SQL-86, SQL-89, SQL-92, SQL-99 等标准。
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