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                > `where`將會追加查詢條件 > 下面是一些實用的例子: ```php //基礎條件查詢 Db('user')->select([ 'where' => [ 'age' => 12, 'username' => '張三' ] ])->get(); //sql:SELECT * FROM `user` WHERE `age` = 12 and `username` = '張三'; //查詢年齡大于20的所有用戶,傳遞一個數組,第一個值可以是任意的比較符號,還可以是in Db('user')->select([ 'where' => [ 'age' => array('>' , 20) ] ])->get(); //查詢年齡大于20且小于40的用戶,傳遞一個數組,第二個值為自定義的條件 Db('user')->select([ 'where' => [ 'age' => array('string' , '> 20 and age < 40') ] ])->get(); ``` > SQL小常識:在設置查詢條件時,數據庫會從左邊進行處理條件,我們應該將過濾更多數據的條件置前,比如: > ```php > //條件2,過濾的數據比條件1多 > select * from news where lookNumber > 10 and type=1 > > //改寫 > select * from news where type=1 and lookNumber > 10 > ```
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