Question

我们有以下查询在MSSQL中完美运行但无法在MySQL中运行：

select CONVERT(datetime, dateVal) as DateOccurred, itemID, COUNT(*) as Hits from (
select itemID, CONVERT(datetime, DateClickUTC) as dateVal
from tb_items
where DateClickUTC >= '2008-06-03 22:00:28.893' and DateClickUTC <= '2013-06-03 22:00:28.893'
group by CONVERT(datetime, DateClickUTC), UserID, itemID) as a
group by a.dateVal, itemID

我们从MySQL得到的错误说：

语法错误，意外IDENT_QUOTED

第一行的dateVal变量发生此错误：＆＃34;选择CONVERT（datetime， dateVal ）。＆＃34;

如果我们删除第一个CONVERT，那么错误就会移到下一行的下一个CONVERT。所以，很明显，我们的日期时间转换似乎有误。不知道我们做错了什么，有什么想法吗？谢谢大家。

Answer 1

我更喜欢使用CAST，但正如其他人所说，你需要在字段之后指定类型：

convert(DateClickUTC,datetime)

以下是使用CAST的工作示例：

select  a.dateVal as DateOccurred, itemID, COUNT(*) as Hits 
from (
  select itemID, cast(DateClickUTC as datetime) as dateVal
  from tb_items
  where DateClickUTC >= '2008-06-03 22:00:28.893' and DateClickUTC <= '2013-06-03 22:00:28.893'
  group by cast(DateClickUTC as datetime), UserID, itemID
) as a
group by a.dateVal, itemID

SQL Fiddle Demo

顺便说一句 - 在这种情况下你实际上不需要子查询 - 这也应该有效：

select cast(DateClickUTC as datetime) as DateOccurred, 
   itemID, 
   COUNT(*) as Hits 
from tb_items
where DateClickUTC >= '2008-06-03 22:00:28.893' and DateClickUTC <= '2013-06-03 22:00:28.893'
group by cast(DateClickUTC as datetime), itemID

MySQL转换为datetime语法错误：意外IDENT_QUOTED

1 个答案: