SQL仅在总和大于100时选择所有记录

Question

我不确定如何问这个,所以我举个例子

我有一张类似这样的巨大桌子......

Name Widgets TransDate  Location
Abby  2      12/1/2010  Middleton
Abby  13     1/10/2011  Burmingham
Bobby 10     12/12/2011 Easton
Bobby 5      10/10/2011 Weston
.
.

我目前的sql语句是......

SELECT name, widgets, TransDate, Location 
FROM MyTable
WHERE TransDate BETWEEN 1/1/2011 and 12/31/2011

给我一张这样的桌子......

Name Widgets TransDate  Location
Abby  13     1/10/2011  Burmingham
Bobby 15     12/12/2011 Easton
Bobby 5      10/10/2011 Weston
.
.

我如何修改上面的SQL,以便除去那些不符合Widget配额X的人的记录...说X = 16.在这种情况下,Abby会被删除,因为她的小部件总数是13和Bobby的记录将保留,因为他的总数是20.

先感谢您!

Answer 1

如果我理解您的请求,您希望获得与您已经获得的结果类似的结果,但要过滤那些符合配额的名称.如果这是正确的,您可以使用IN()子查询来查找分组为> = 100个小部件的名称.

SELET name, widgets, TransDate, Location FROM MyTable 
WHERE
  /* IN() subquery for names meeting the quota */
  name IN (
     SELECT name 
     FROM tbl 
     /* If they must have met the quota only during the time window, uncomment below */
     /* Otherwise, omit the WHERE clause to find those who have met the quota at any time */
     /* WHERE TransDate BETWEEN '1/1/2011' and '12/31/2011' */
     GROUP BY name 
     HAVING SUM(widgets) >= 100

  ) 
  AND TransDate BETWEEN '1/1/2011' and '12/31/2011'

Answer 2

对于SQL Server，可以这样做

SELECT m.name, m.widgets, m.TransDate, m.Location 
FROM MyTable m
JOIN(SELECT name, SUM(widgets) 
            FROM  MyTable 
            WHERE TransDate BETWEEN '1/1/2011' and '12/31/2011'
            GROUP BY NAME 
            HAVING SUM(widgets) >= 16) x
ON x.NAME = m.NAME
WHERE m.TransDate BETWEEN '1/1/2011' and '12/31/2011'