eThe argument is treated as scientific notation (e.g. 1.2e+2). The precision specifier stands for the number of digits after the decimal point since PHP 5.2.1. In earlier versions, it was taken as number of significant digits (one less).

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排一下序就行嘛，比如：`ORDER BY username LIKE CONCAT('%','张三','%') DESCLIMIT 0,10`这里DESC代表相关性从大到小强制让全等条件在前面可以再加一个排序条件：`ORDER BY username = '张三' DESC, username LIKE CONCAT('%','张三','%') DESCLIMIT 0,10`

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