Question

所以我有一个像下面那样的表结构。

以下是条件：

我将'Tag'称为没有Condition（x）的ID为NULL。
我将'UnTag'称为任何条件（x）的ID为NULL。
我想按以下格式对“分类1”进行分类：

我想要输出以下结构：

我写了一段代码，但不知怎的，它没有给我想要的结果。我使用Case何时对Classification1进行分类，然后运行子查询以取出Count。如果有不同的方法以及如何在分组声明中合并案例，请提供帮助。

我写了这个查询： SELECT CASE WHEN UPPER(CM1.Classification1) IN ('A', 'C','G') THEN 'X' WHEN UPPER(CM1.Classification1) IN ('B', 'F') THEN 'Y' WHEN UPPER(CM1.Classification1) IN ('D', 'E') THEN 'Z' ELSE 'Undefined' END AS New_Classification, (SELECT COUNT(CASE WHEN UPPER(CM2.Classification1) IN ('A', 'C','G') THEN 'X' WHEN UPPER(CM2.Classification1) IN ('B', 'F') THEN 'Y' WHEN UPPER(CM2.Classification1) IN ('D', 'E') THEN 'Z' ELSE 'Undefined' END) FROM TABLE1 CM2 WHERE CM2.Condition1 IS NOT NULL AND CM2.Condition2 IS NOT NULL AND CM2.Condition3 IS NOT NULL AND CM2.Condition4 IS NOT NULL AND CM1.ID=CM2.ID) AS Count_of_tagged, (SELECT COUNT(CASE WHEN UPPER(CM3.Classification1) IN ('A', 'C','G') THEN 'X' WHEN UPPER(CM3.Classification1) IN ('B', 'F') THEN 'Y' WHEN UPPER(CM3.Classification1) IN ('D', 'E') THEN 'Z' ELSE 'Undefined' END) FROM TABLE1 CM3 WHERE (CM3.Condition1 IS NULL OR CM3.Condition2 IS NULL OR CM3.Condition3 IS NULL OR CM3.Condition4 IS NULL) AND CM1.ID=CM2.ID) AS Count_of_untagged FROM TABLE1 CM1

Answer 1

你不应该需要一个子查询，作为我提出的出发点：

    SELECT CASE Classification1
             WHEN 'A' THEN 'X'
             WHEN 'B' THEN 'Y'
             WHEN 'C' THEN 'X'
             WHEN 'D' THEN 'Z'
             WHEN 'E' THEN 'Z'
             WHEN 'F' THEN 'Y'
             WHEN 'G' THEN 'X'
           END new_classification,
           SUM(
             Condition1 IS NOT NULL AND
             Condition2 IS NOT NULL AND
             Condition3 IS NOT NULL AND
             Condition4 IS NOT NULL  /* 1 for true, 0 for false */          
           ) tagged_count,
           SUM(
             Condition1 IS NULL OR
             Condition2 IS NULL OR
             Condition3 IS NULL OR
             Condition4 IS NULL            
           ) untagged_count,
      FROM table_name
  GROUP BY new_classification

Answer 2

可以尝试使用以下sql并告诉我这是否是您需要的

select 
CASE 
      WHEN classification ='A'  THEN 'X'
      WHEN classification ='B'  THEN 'Y'
      WHEN classification ='C'  THEN 'X'
      WHEN classification ='D'  THEN 'Z'
      WHEN classification ='E'  THEN 'Z'
      WHEN classification ='F'  THEN 'Y'
      WHEN classification ='G'  THEN 'X'
END as classification, 
sum(case when condition1 is not null and condition2 is not null and condition3 is not null and condition4 is not null then 1 else 0 end) as tagged
sum(case when condition1 is null or condition2 is null or condition3 is null or  condition4 is null then 1 else 0 end) as untagged
 from table
GROUP   BY CASE 
      WHEN classification ='A'  THEN 'X'
      WHEN classification ='B'  THEN 'Y'
      WHEN classification ='C'  THEN 'X'
      WHEN classification ='D'  THEN 'Z'
      WHEN classification ='E'  THEN 'Z'
      WHEN classification ='F'  THEN 'Y'
      WHEN classification ='G'  THEN 'X'
END ;

查询在2个不同的条件下使用Case When Statement获取Ids的计数

2 个答案: