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                > `field`是用戶定義查詢的返回字段,其需要為數組信息,每個元素都是一個獨立的字段信息 > 下面是一些使用的例子: ```php //只查詢姓名和郵箱 Db('user')->select([ 'field' => ['username','email'] ])->get(); //sql:SELECT `username`,`email` FROM `user` //使用函數統計個數 Db('user')->select([ 'field' => ['count(id) as userNumber'] ])->find(); //sql:SELECT count(id) as userNumber FROM `user` //使用函數去除重復姓名 Db('user')->select([ 'field' => ['distinct username'] ])->get(); //sql:SELECT distinct username FROM `user` //使用NOT來排除字段,例如字段有:Id,username,password,age,gender Db('user')->select([ 'field' => [ 'NOT' => ['Id','password'] ] ])->get(); //sql:SELECT `username`,`age`,`gender` FROM `user` ``` > SQL小常識:在查詢數據中我們需要避免使用*號來代替字段信息,使用精準的字段名稱將大大提高查詢速度
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