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                在應用中我們經常會用到一些統計數據,例如當前所有(或者滿足某些條件)的用戶數、所有用戶的最大積分、用戶的平均成績等等,ThinkPHP為這些統計操作提供了一系列的內置方法,包括: | 方法 | 說明 | |-----|-----| | Count | 統計數量,參數是要統計的字段名(可選) | | Max | 獲取最大值,參數是要統計的字段名(必須) | | Min | 獲取最小值,參數是要統計的字段名(必須) | | Avg | 獲取平均值,參數是要統計的字段名(必須) | | Sum | 獲取總分,參數是要統計的字段名(必須) | 用法示例: ~~~ $User = M("User"); // 實例化User對象 ~~~ 獲取用戶數: ~~~ $userCount = $User->count(); ~~~ 或者根據字段統計: ~~~ $userCount = $User->count("id"); ~~~ 獲取用戶的最大積分: ~~~ $maxScore = $User->max('score'); ~~~ 獲取積分大于0的用戶的最小積分: ~~~ $minScore = $User->where('score>0')->min('score'); ~~~ 獲取用戶的平均積分: ~~~ $avgScore = $User->avg('score'); ~~~ 統計用戶的總成績: ~~~ $sumScore = $User->sum('score'); ~~~ 并且所有的統計查詢均支持連貫操作的使用。
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