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【SQL查询】查询的列起别名_AS
方法一: 以as关键字指定字段别名,as在select的字段和别名之间。
方法二: 直接在字段名称后面加上别名,中间以空格隔开。
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原文地址:https://www.cnblogs.com/zhuhaiying/p/7904838.html
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