mysql update 加条件

MySQL的UPDATE语句可以通过WHERE条件来限制更新的数据范围。在UPDATE语句中，可以使用table_references指定要更新的表，并使用assignment_list指定要更新的字段及其新值。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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