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最简单的查询结果语句如何写

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Release： 2016-06-13 12:31:11
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最简单的查询结果语句怎么写
我不会PHP，但是现在只有PHP的空间，
想要一个功能，很简单的一个，

数据表里就两列（A & B）
实现：我在文本框输入一个值，在数据库查询A列中这个值所对应的B列的值并返回给页面。

额...有大神能帮帮忙写个现成的较完整语句呗？ 包括数据库连接语句部分的

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