Question

我有这个sql命令：

SELECT RecordedBy as 'Recorded By', COUNT(*) Total 
FROM mytable 
WHERE 
StartedDate BETWEEN DATEADD(day, DATEDIFF(day, 0, CURRENT_TIMESTAMP), '00:01AM')
AND DATEADD(day, DATEDIFF(day, 0, CURRENT_TIMESTAMP), '11:59PM')
group by RecordedBy order by Total desc

我想要完成的是通过将此sql嵌入另一个而不更改原始sql 来进一步优化此查询的结果。

例如，我想通过RecordedBy子句缩小原始sql的范围：我要做的是：

select * from mytable in
(
    SELECT RecordedBy as 'Recorded By', COUNT(*) Total  FROM mytable  
    WHERE  StartedDate BETWEEN 
    DATEADD(day, DATEDIFF(day, 0, CURRENT_TIMESTAMP),'00:01AM')
    AND DATEADD(day, DATEDIFF(day, 0, CURRENT_TIMESTAMP),'11:59PM') 
    group by RecordedBy order by Total desc
)

但当然这会导致语法错误。谁能想到我现在想念的东西？

Answer 1

你可以试试这个

select * from 
(
  SELECT RecordedBy as 'Recorded By', 
         COUNT(*) Total
  FROM mytable  
  WHERE  StartedDate 
         BETWEEN 
          DATEADD(day, DATEDIFF(day, 0, CURRENT_TIMESTAMP),'00:01AM')  
          AND 
          DATEADD(day,  DATEDIFF(day, 0, CURRENT_TIMESTAMP), '11:59PM')  
) as TAB
group by TAB.RecordedBy 
order by TAB.Total desc

Answer 2

正确的语法是：

select * from 
(
    SELECT RecordedBy as 'Recorded By', COUNT(*) Total  FROM mytable  
    WHERE  StartedDate BETWEEN 
    DATEADD(day, DATEDIFF(day, 0, CURRENT_TIMESTAMP),'00:01AM')
    AND DATEADD(day, DATEDIFF(day, 0, CURRENT_TIMESTAMP),'11:59PM') 
    group by RecordedBy order by Total desc
) mytable

试试吧。

缩小sql结果集

2 个答案: