Question

我有一个类似

的查询

SELECT weeks_ind, weeks_rol, weeks_no, date,
CASE WHEN SUM(CASE WHEN rec = 'Y' THEN 1 ELSE 0 END) >= 1 THEN 'Y' ELSE 'N' END "rec",
CASE  WHEN (SUM( CASE WHEN glob is null THEN 1 WHEN glob = Id THEN 2 ELSE 0 END ))  = 3 THEN 'Many'      
WHEN (SUM( CASE WHEN glob is null THEN 1 WHEN glob = Id THEN 2 ELSE 0 END ))  = 2  THEN 'One'       
ELSE 'None' END "Type"
FROM Table WHERE Id = '12345'
AND ((visible = 'Y' AND rec = 'N') OR rec = 'Y') AND days = 100
GROUP BY date, weeks_no, weeks_ind, weeks_rol
ORDER BY date, weeks_no;

并且按预期效果运行良好，返回所有记录。但是，如果我将“ rec”添加为GROUP

GROUP BY date, weeks_no, weeks_ind, weeks_rol, rec

查询不会返回所有记录，并且更多的是，类型错误。任何想法为什么会这样？我知道该小组仅对记录进行分组，而不会影响记录的数量。

Answer 1

rec中的GROUP BY是表中的那个，而不是查询中被简化为'Y'/'N'的那个。

您需要输入内部查询，例如：

SELECT weeks_ind, weeks_rol, weeks_no, date,
CASE  WHEN (SUM( CASE WHEN glob is null THEN 1 WHEN glob = Id THEN 2 ELSE 0 END ))  = 3 THEN 'Many'      
WHEN (SUM( CASE WHEN glob is null THEN 1 WHEN glob = Id THEN 2 ELSE 0 END ))  = 2  THEN 'One'       
ELSE 'None' END "Type"
from (
  SELECT weeks_ind, weeks_rol, weeks_no, date,
  CASE WHEN SUM(CASE WHEN rec = 'Y' THEN 1 ELSE 0 END) >= 1 THEN 'Y' ELSE 'N' END "rec"
  FROM Table WHERE Id = '12345'
  AND ((visible = 'Y' AND rec = 'N') OR rec = 'Y') AND days = 100
  GROUP BY date, weeks_no, weeks_ind, weeks_rol
) group by date, weeks_no, weeks_ind, weeks_rol, rec
ORDER BY date, weeks_no;

Group By子句更改结果

1 个答案: