通過PHP有條件地計算MYSQL列的行數和輸出數據

Question

對不起，我是新手。只是想學習。我試圖有條件地使用case和count函數統計SQL中發生特定情況的次數。這個計數存儲在eeg表中的男性/女性的數量。這是我的SQL查詢。

SELECT COUNT(CASE WHEN `Gender` = 'Male' THEN 1 END), 
     COUNT(CASE WHEN `Gender` = 'Female' THEN 1 END) 
FROM `eeg` 

當我運行的MySQL後端（phpMyAdmin的）查詢該輸出數據，但在我的PHP文件，我得到了這2行的「未定義指數」的錯誤。所有其他行都非常好。我不知道如何將這些特定的數據集輸出到變量中。

這裏是在PHP文件SQL查詢（全稱）：

$result = mysql_query("SELECT MONTH(ScanDate), YEAR(ScanDate), 
          COUNT(Investigation), 
          COUNT(CASE WHEN `Gender` = 'Male' THEN 1 END), 
          COUNT(CASE WHEN `Gender` = 'Female' THEN 1 END), 
          SUM(InvestigationAmount), SUM(AmountDue) 
         FROM eeg 
         WHERE Investigation = '{$investigation}' 
          AND ScanDate BETWEEN '{$ScanDate1}' 
          AND '{$ScanDate2}'"); 

這裏是while循環（全稱）：

while($row=mysql_fetch_array($result)){ 
    $month_doe=$row['MONTH(ScanDate)']; 
    $year_doe=$row['YEAR(ScanDate)']; 
    $si=$row['COUNT(Investigation)']; 
    $male=$row["COUNT(CASE WHEN 'Gender' = 'Male' THEN 1 END)"]; 
    $female=$row["COUNT(CASE WHEN 'Gender' = 'Female' THEN 1 END)"]; 
    $sum_investigation=number_format($si); 
    $sia=$row['SUM(InvestigationAmount)']; 
    $sum_investigationamount=number_format($sia); 
    $srd=$row['SUM(AmountDue)']; 
    $sum_rebatedue=number_format($srd); 
} 

謝謝您的幫助。從字面上拉我的頭髮，但愛學習和提高。是的，請求mysql_query折舊：d

截圖如下：

代碼截圖

Answer 1

使用的別名表情和使用別名，訪問PHP表達式的結果：

$result = mysql_query("SELECT MONTH(ScanDate) as sdyear, 
           YEAR(ScanDate) as sdmonth, 
          COUNT(Investigation) as investigation, 
          COUNT(CASE WHEN `Gender` = 'Male' THEN 1 END) as MaleCount, 
          COUNT(CASE WHEN `Gender` = 'Female' THEN 1 END) as FemaleCount, 
          SUM(InvestigationAmount) as investigationamount, 
          SUM(AmountDue) as amountdue 
         FROM eeg 
         WHERE Investigation = '{$investigation}' 
          AND ScanDate BETWEEN '{$ScanDate1}' 
          AND '{$ScanDate2}'"); 


while($row=mysql_fetch_array($result)){ 
    $month_doe=$row['sdmonth']; 
    $year_doe=$row['sdyear']; 
    $si=$row['investigation']; 
    $male=$row["MaleCount"]; 
    $female=$row["FemaleCount"]; 
    $sum_investigation=number_format($si); 
    $sia=$row['investigationamount']; 
    $sum_investigationamount=number_format($sia); 
    $srd=$row['amountdue)']; 
    $sum_rebatedue=number_format($srd); 
} 

我會使用這種方法爲每個字段是一個表達式（其他sum（）字段在th e以上查詢）。