年（日付）と月（日付）にMYSQL GROUP BY WITH ROLLUPを使用する場合、Nullを '合計'に変更できません

Question

GROUP BY WITH ROLLUPを使用してテーブルを作成し、nullではなく合計行を取得します。

$sql ="SELECT 
      IF(YEAR(transaktioner.datum) is null or YEAR(transaktioner.datum) = '','Total',YEAR(transaktioner.datum)) as Year, 
      IF(MONTH(transaktioner.datum) is null or MONTH(transaktioner.datum) = '','Total',MONTH(transaktioner.datum)) as Month,      
      SUM(transaktioner.belopp)*0.01 as Belopp 
     FROM transaktioner 
      GROUP BY 
       Year, 
       Month 
      WITH ROLLUP 
    "; 


$result = $conn->query($sql); 

if ($result->num_rows > 0) { 
    // output data of each row 
    while($row = $result->fetch_assoc()) { 
     echo "||Year:". $row["Year"]."|MONTH:" . $row["Month"]. "|Sum:" . $row["Belopp"]. " "; 
    } 
} else { 
    echo "0 results"; 
} 
$conn->close(); 

ただし出力は、それが私を与える代わりに、私の真または偽を与えるものではありません：

|Year:2016|MONTH:1|Sum:408.1797 | 
|Year:2016|MONTH:10|Sum:-70.6915 | 
|Year:2016|MONTH:11|Sum:-189.0771 | 
|Year:2016|MONTH:12|Sum:-51.7362 | 
|Year:2016|MONTH:2|Sum:67.5001 | 
|Year:2016|MONTH:3|Sum:132.6177 | 
|Year:2016|MONTH:4|Sum:-36.4121 | 
|Year:2016|MONTH:5|Sum:-121.8800 | 
|Year:2016|MONTH:6|Sum:294.5811 | 
|Year:2016|MONTH:7|Sum:76.3505 | 
|Year:2016|MONTH:8|Sum:-201.3231 | 
|Year:2016|MONTH:9|Sum:-62.8723 | 
|Year:2016|MONTH: |Sum:245.2368 | 
|Year:2017|MONTH:1|Sum:156.2617 | 
|Year:2017|MONTH:2|Sum:-166.7156 | 
|Year:2017|MONTH:3|Sum:-183.3601 | 
|Year:2017|MONTH:4|Sum:-213.6732 | 
|Year:2017|MONTH:5|Sum:-149.0897 | 
|Year:2017|MONTH:6|Sum:-120.2097 | 
|Year:2017|MONTH:7|Sum:-302.1064 | 
|Year:2017|MONTH:8|Sum:-183.0638 | 
|Year:2017|MONTH:9|Sum:-119.3371 | 
|Year:2017|MONTH: |Sum:-1281.2939 | 
|Year: |MONTH: |Sum:347.6165 

それは代わりに「合計」を言うの空白です。何が間違っているのですか？私はifnull（）も同様の問題で試しました。

Answer 1

あなたはSQLのチェックを行いたい場合は、サブクエリにグループ化されたクエリを配置する必要があり、メインクエリで出力を処理：

SELECT IFNULL(Year, 'Total') AS Year, 
     IFNULL(Month, 'Total') AS Month, 
     Belopp 
FROM (
    SELECT YEAR(transaktioner.datum) AS Year, 
      MONTH(transaktioner.datum) AS Month, 
      SUM(transaktioner.belopp) * 0.01 AS Belopp 
    FROM transaktioner 
    GROUP BY Year, Month 
    WITH ROLLUP 
) AS x 

あなたはまた、単に、グループ化されたクエリを行うことができますそして、PHPでNULLをチェック：

while($row = $result->fetch_assoc()) { 
    if ($row["Year"] == null) { 
     $row["Year"] = "Total"; 
    } 
    if ($row["Month"] == null) { 
     $row["Month"] = "Total"; 
    } 
    echo "||Year:". $row["Year"]."|MONTH:" . $row["Month"]. "|Sum:" . $row["Belopp"]. " "; 
}