Question

我正在尝试编写一个查询来从我们的数据库中提取一些信息，我需要将其分组为字符串的一部分。所以我做了GROUP BY substring（）。但是看起来即使我是substring（）的列在SELECT语句中，它仍然会失败。我还尝试将substr（）放在select中，并使用它来执行“AS x”，但是也会因为它在GROUP BY之后执行而失败。

SELECT 
M.Cabot_source, 
CASE substring(M.Cabot_source,6,1) 
WHEN 'C' THEN 'CoregUserNameLC' 
WHEN 'P' THEN 'PPC' 
WHEN 'O' THEN 'Organic' 
WHEN 'S' THEN 'Ad Swap' 
WHEN 'I' THEN 'Internal' 
ELSE 'Unknown' 
END as source_type
FROM members_ M 
WHERE M.Cabot_source != '' 
GROUP BY substring(M.Cabot_source,6,1)

这是它返回给我的错误：

数据库连接报告的SQL错误：

(0x3ddbe8) Lyris function: SQLClass::SendToSQLInternal() 
Lyris error description: Command.Open() failed with error code 80040e14 
Database error information: Error 8120: Column 'members_.Cabot_source' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause. 
(source: Microsoft OLE DB Provider for SQL Server) 
SQL Statement: SELECT M.Cabot_source, CASE substring(M.Cabot_source,6,1) WHEN 'C' THEN 'CoregUserNameLC' WHEN 'P' THEN 'PPC' WHEN 'O' THEN 'Organic' WHEN 'S' THEN 'Ad Swap' WHEN 'I' THEN 'Internal' ELSE 'Unknown' END as source_type FROM members_ M WHERE M.Cabot_source != '' GROUP BY substring(M.Cabot_source,6,1)

Answer 1

您必须对完整的案例陈述进行分组。

SELECT 
M.Cabot_source, 
  CASE substring(M.Cabot_source,6,1) 
   WHEN 'C' THEN 'CoregUserNameLC' 
   WHEN 'P' THEN 'PPC' 
   WHEN 'O' THEN 'Organic' 
   WHEN 'S' THEN 'Ad Swap' 
   WHEN 'I' THEN 'Internal' 
   ELSE 'Unknown' 
  END as source_type
FROM members_ M 
WHERE M.Cabot_source != '' 
GROUP BY 
  M.Cabot_source, 
  CASE substring(M.Cabot_source,6,1) 
   WHEN 'C' THEN 'CoregUserNameLC' 
   WHEN 'P' THEN 'PPC' 
   WHEN 'O' THEN 'Organic' 
   WHEN 'S' THEN 'Ad Swap' 
   WHEN 'I' THEN 'Internal' 
   ELSE 'Unknown' 
  END

Answer 2

错误的罪魁祸首是::

“

(SELECT COUNT(*) FROM members_ M3 WHERE M3.Cabot_source = M.Cabot_source) as names, 
(SELECT COUNT(*) FROM members_ M2 WHERE M2.MemberType_ = 'normal' AND M2.Cabot_source = M.Cabot_source)

“

Answer 3

你可以select M.Cabot_source + group by M.Cabot_source或使用任何聚合函数，例如select max(M.Cabot_source)

唯一的例外是MySQL，其中有一个隐式聚合函数 - 我称之为return_random_record(M.Cabot_source)，但MySQL的默认（可能是未定义的）行为不能通过SQL Server驱动程序获得

如何在MS SQL中对SUBSTRING（）进行GROUP BY

3 个答案: