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可在安卓获取Learn SQL的历史版本
SQL是一种数据库计算机语言，旨在进行检索和管理。
SQL is a database computer language designed for the retrieval and management of data in a relational database. SQL stands for Structured Query Language. This application will give you a quick start to SQL. It covers most of the topics required for a basic understanding of SQL and to get a feel of how it works.