SQL得到它們是空字段/空對返回的每條記錄

Question

我有我使用來獲取其具有設置爲如NULL或''以下列中的至少一個記錄其下面的查詢：

• MainImage
• 摘要

• 說明

  DECLARE @missingFields varchar(100) 
  SET @missingFields = '' 
  
  SELECT 
  
  c.[UnitReference] as 'UnitRef', 
  t.[NodeName] as 'Property', 
  @missingFields as 'Field/s missing' 
  
  FROM [DetailPage] d 
  INNER JOIN [CRM] c 
  ON d.ItemID = c.ItemID 
  INNER JOIN 
  [Tree] t 
  ON d.[ID] = t.[ID] 
  
  WHERE (ISNULL(d.MainImage, '') = '' OR ISNULL(d.Summary,'') = '' OR ISNULL(d.[Description],'') = '') 
  AND c.[IsListed] = 1 AND c.[IsMarketed] = 1 
  

這會返回我想要的數據，但是我還需要建立一個字符串，列出返回的記錄中哪些列爲空或空的列。 "Main Image is empty, Description is empty"當記錄有空時MainImage和Description列。

我已經試過：

@missingFields = CASE WHEN ISNULL(MainImage, '') = '' THEN 'Main image is null' ELSE '' END -- etc... 

但我不能與數據檢索操作包括這一點。我會如何去做這件事？

Answer 1

SELECT c.[UnitReference] AS 'UnitRef', 
      t.[NodeName] AS 'Property', 
      (CASE 
       WHEN d.MainImage IS NULL 
       THEN 'Main Image is Null, ' 
       WHEN d.MainImage = '' 
       THEN 'Main Image is Empty, ' 
       ELSE '' 
      END)+ 
      (CASE 
       WHEN d.Summary IS NULL 
       THEN 'Summary is Null, ' 
       WHEN d.Summary = '' 
       THEN 'Summary is Empty, ' 
       ELSE '' 
      END)+ 
      (CASE 
       WHEN d.[Description] IS NULL 
       THEN 'Description is Null, ' 
       WHEN d.[Description] = '' 
       THEN 'Description is Empty, ' 
       ELSE '' 
      END) AS MissingFields 
    FROM [DetailPage] d 
    INNER JOIN [CRM] c 
    ON d.ItemID = c.ItemID 
    INNER JOIN [Tree] t 
    ON d.[ID] = t.[ID] 
    WHERE(d.MainImage IS NULL OR d.MainImage = '') 
    OR (d.Summary IS NULL OR d.Summary = '') 
    OR (d.[Description] IS NULL OR d.[Description] = '') 
    AND c.[IsListed] = 1 
    AND c.[IsMarketed] = 1