MySQL includes a number of built-in string manipulation functions that are similar to the functions provided by Web scripting languages such as PHP. You can use these functions in both the "SELECT" ...
在编写SQL语句时，常需按业务需求提取特定日期的数据。此时可利用substring()函数对日期进行截取，灵活获取年、月、日等部分信息，以满足查询条件。掌握该函数的用法，有助于高效处理时间字段 ...
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