MySQLクエリ：CONCAT_WSとCOALESCEを使用して、コンマで区切られた結果値を適切に識別し、元の概念に再変換する方法

より一般的なケースでは、目標が正の整数値のコンマ区切りリストを対応する文字列のリストに同じ順序で「変換」することである場合元の値のリストとして、無関係な「commata」とスペースを導入せずに...

それを達成するために恐ろしい表現を振るうことができます。

デモンストレーションとして。

SELECT op.OP2RevisionIndikation
      , CONCAT_WS(', '
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',',  1 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',',  2 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',',  3 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',',  4 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',',  5 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',',  6 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',',  7 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',',  8 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',',  9 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 10 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 11 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 12 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 13 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 14 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 15 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 16 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 17 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 18 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 19 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
        , ELT(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT(op.OP2RevisionIndikation,REPEAT(',',21)),',', 20 ),',',-1)+0,'Innere Hernie (Meso)','Innere Hernie (PETERSEN)','Weight Regain','Weight Loss Failure','Anastomosenstenose','Dysphagie','Reflux','Gallenreflux','Malnutrition','Diarrhö','Gastrogastrale Fistel','Ulcusperforation','Chronische Ulcus','Chronische Schmerzen','Ileus','Choledocholithiasis nach Magen-Bypass','Leakage') 
   ) AS translated
  FROM ( SELECT '' AS OP2RevisionIndikation 
         UNION ALL SELECT '17'         
         UNION ALL SELECT '3'
         UNION ALL SELECT '3, 17'
         UNION ALL SELECT '17, 3, 7'
         UNION ALL SELECT '17 , ,, ,3, flurb, 747, 17'
         UNION ALL SELECT ', x,,,,000017,, 3x  ,,x, 01,,17'
       ) AS op

を返します

OP2RevisionIndikation            translated
-------------------------------  -------------------------------------------------------

17                               Leakage
3                                Weight Regain
3, 17                            Weight Regain, Leakage
17, 3, 7                         Leakage, Weight Regain, Reflux
17 , ,, ,3, flurb, 747, 17       Leakage, Weight Regain, Leakage
^^       ^              ^^
, x,,,,000017,, 3x  ,,x, 01,,17  Leakage, Weight Regain, Innere Hernie (Meso), Leakage
           ^^   ^         ^  ^^

注意事項と注意事項：

各ELT 行は正確です抽出する整数のコンマ区切りリストのn番目の要素、1番目、4番目、5番目などを基本的に指定する1つの整数を除くレプリカ。

式は、リスト内の有限数の要素のみを処理します。要素ごとに個別のELT式が必要です。この例では、コンマ区切りのリストで最大20個の要素を処理します。これを拡張して、より多くの要素を処理することができます。

これはのみ「機能」します正の整数値のコンマ区切りリストの場合。コンマの間の各値は整数として評価されます。つまり、要素'x17' 0に評価されます。要素'-6.2' -6に評価されます。要素
'007jamesbond' 7に評価されます。など。

評価からの整数値は、ELT内の文字列のリストから文字列を「検索」するためのインデックスとして使用されます。機能。

リスト内の文字列に対応しない整数値に評価される要素（例：0 、-6 ）は、要素が元のリストに存在しなかったかのように無視されます。

例で返される最後の2行の行は、おそらく不正な形式であると見なされるコンマ区切りのリストの動作を示しています。翻訳式は「ベストエフォート」であり、翻訳できるものを返します。カンマ区切りのリストの形式が正しくない場合、式はエラーをスローしたり、NULLまたは空の文字列を返したりしません。