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                【萬能SQL語句】 ``` $sql = "SELECT * FROM user"; // select all data $sql = "SELECT * FROM user WHERE TO_DAYS( NOW( ) ) - TO_DAYS(create_date) <= 1"; //select yesterday data $sql = "SELECT * FROM user WHERE DATE_FORMAT(create_date,'%Y%m')=DATE_FORMAT(CURDATE(),'%Y%m')"; //select this month data $query = $this->db->query($sql); return $query->result(); ``` 強SQL查詢用mysql原生語句的優點是資源多,適用于不同開發語言,如果用codeigniter方式的sql,就只適用于php的codeigniter,資源明顯很多,因此難寫很多。 參考: https://www.cnblogs.com/shuilangyizu/p/8805384.html
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