非联合查询列未按预期结果

Question

在这里，我从不同的表中获取所有 id，并使用“with”语句将其存储在数据集中。我需要的是，对于所有这些 id，我想从 CO_C 中提取一个名为“stat”的列。

我假设我可能需要合并 unionall 的结果，然后在 id 上使用 CO_C 进行左连接。

CO_C 表如下所示：

id           Stat
FJERHT     Executed
HRFGER     Not Executed
JEREFH     other 
JFHZFH     Executed

查询

with dataset as(
SELECT DISTINCT
  NAME AS id,
  'DIM' as "Source"
FROM
  CO_D

UNION ALL

SELECT DISTINCT
  PRO_ID AS id,
  'CON' as "Source"
  stat as stat         -----> this gives me error query block has an incorrect number of result columns
FROM
  CO_C

UNION ALL

SELECT DISTINCT
  P_ID AS id,
  'STU' as "Source"
FROM
  CO_O

select * from dataset
PIVOT (
    COUNT(*)
    FOR "Source"
    IN (
'DIM' as "Avail",
'CON' as CON,
'STU' as STU)

我尝试过的更新：

SELECT ID, stat
FROM CO_C
WHERE ID IN
(with dataset as(
    SELECT DISTINCT
      NAME AS id,
      'DIM' as "Source"
    FROM
      CO_D
    
    UNION ALL
    
    SELECT DISTINCT
      PRO_ID AS id,
      'CON' as "Source"
      stat as stat          
    FROM
      CO_C
    
    UNION ALL
    
    SELECT DISTINCT
      P_ID AS id,
      'STU' as "Source"
    FROM
      CO_O
    
    select * from dataset
    PIVOT (
        COUNT(*)
        FOR "Source"
        IN (
    'DIM' as "Avail",
    'CON' as CON,
    'STU' as STU)

错误：缺少选择关键字

Answer 1

在 UNION 查询中，所有正在组合的查询必须提供相同数量的列。在您的情况下，引发错误的 SELECT 具有三列，而前一个 SELECT 仅返回两列。如果这是您想要的，您可能需要考虑为只返回两列的查询中未使用的列提供 NULL。

Answer 2

SELECT ID, stat
FROM CO_C
WHERE ID IN
(
    SELECT DISTINCT
      NAME AS id,
      'DIM' as "Source"
    FROM
      CO_D
    
    UNION ALL
    
    SELECT DISTINCT
      PRO_ID AS id,
      'CON' as "Source"
      stat as stat          
    FROM
      CO_C
    
    UNION ALL
    
    SELECT DISTINCT
      P_ID AS id,
      'STU' as "Source"
    FROM
      CO_O)