Question

您好我正在尝试获取某些月份的记录。例如，对于此查询，我希望用户看到当前月份“May”和过去一个月将是“April”。从那时起，我不希望我的查询在任何其他月份运行。我坚持这个查询，无法弄明白。基本上我需要一个函数在我的查询中自动知道这个月和1个月前显示记录。谢谢

DECLARE @Year int
set @Year = 2014
SELECT d.name, a.dealer_code, b.last_name, b.city, b.state, b.phone

   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 1 THEN 1 ELSE NULL END) January
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 2 THEN 1 ELSE NULL END) Feburary
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 3 THEN 1 ELSE NULL END) March
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 4 THEN 1 ELSE NULL END) April
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 5 THEN 1 ELSE NULL END) May
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 6 THEN 1 ELSE NULL END) June
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 7 THEN 1 ELSE NULL END) July
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 8 THEN 1 ELSE NULL END) August
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 9 THEN 1 ELSE NULL END) September
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 10 THEN 1 ELSE NULL END) October
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 11 THEN 1 ELSE NULL END) November
   , COUNT(CASE WHEN  MONTH(c.Funded_date) = 12 THEN 1 ELSE NULL END) December
   , COUNT(*) 'Year to Date'
   FROM tdealer a 
   JOIN tContact b ON a.contact_id = b.contact_id 
   JOIN tContract c ON a.dealer_id = c.dealer_id 
   JOIN tCompany d ON c.company_id = d.company_id
  where YEAR (c.Funded_date) = @Year
  GROUP BY d.name, a.dealer_code, b.last_name, b.city, b.state, b.phone

Answer 1

这里的诀窍是做两件事：

创建一个表达式，将任意DATETIME转换为发生该日期的月份的第一天。
在WHERE和GROUP BY条款中正确使用它。

表达式是

DATE_FORMAT(whatever, '%Y-%m-01')

这需要，例如＆＃39; 2014-05-28 12：22：30＆＃39;，并将其转换为＆＃39; 2014-05-01＆＃39;。将一个有效的DATE转换为另一个有效的DATE非常方便，因为这样你就可以使用MySQL内置的所有良好日期算法。

因此，例如，如果您想要在本月之前的第一个月中使用它：

DATE_FORMAT(NOW(), '%Y-%m-01') - INTERVAL 1 MONTH

以下是您的查询大纲：

SELECT DATE_FORMAT(c.Funded_date, '%Y-%m-01') AS month_beginning,
       d.name, a.dealer_code, b.last_name, b.city, b.state, b.phone,
       COUNT(1) AS itemcount
  FROM tdealer a 
  JOIN tContact b ON a.contact_id = b.contact_id 
  JOIN tContract c ON a.dealer_id = c.dealer_id 
  JOIN tCompany d ON c.company_id = d.company_id
 where c.Funded_date >= DATE_FORMAT(NOW(), '%Y-%m-01') - INTERVAL 1 MONTH
   AND c.Funded_date <  DATE_FORMAT(NOW(), '%Y-%m-01') + INTERVAL 1 MONTH
 GROUP BY DATE_FORMAT(c.Funded_date, '%Y-%m-01'),
          d.name, a.dealer_code, b.last_name, b.city, b.state, b.phone
 ORDER BY d.name, a.dealer_code, b.last_name, b.city, b.state, b.phone,
          DATE_FORMAT(c.Funded_date, '%Y-%m-01')

看看你如何选择两个月的时间？它从本月前一个月的第一天开始，到下个月的第一天结束，但不包括那一天。

如何做这类事情是在http://www.plumislandmedia.net/mysql/sql-reporting-time-intervals/

SQL添加月份

1 个答案: