如何根据某些条件获取记录数？答案

【问题标题】：How to get record count based on based on some conditions?如何根据某些条件获取记录数？
【发布时间】：2014-08-06 06:47:10
【问题描述】：

我需要准备一份报告，该报告将按月显示订单数量，其中收货地址 = 收单地址和收货地址收货地址的订单数量，例如

年月Same_shipbill Diff_shipbill

2014 年 1 月 1768 1233

2014 年 2 月 1234 1222

当前年份等等。

我试过这个查询

SELECT  MAX(DATENAME(YEAR, order_date)) AS [YEAR],
        DATENAME(MONTH, order_date) AS [MONTH],
        COUNT(*) AS SAME_BILL_SHIP
FROM    x_master_order_tb O
         INNER JOIN tbl_Order_Addresses A
           ON A.addressID = O.addressid
WHERE   order_date BETWEEN '2014-01-01 00:00:00:000' AND GETDATE()
         AND wcs_status_id = 1
         AND A.ship_bill = 'Y'
GROUP BY    DATENAME(MONTH, order_date)

此查询仅获取其中 ship = bill address 的计数，不确定如何获取此查询中的“Diff_shipbill”列值？我只需要翻转条件 A.ship_bill = 'N'

【问题讨论】：

标签： sql sql-server sql-server-2008

【解决方案1】：

你的意思是你要像这样计算ship_bill Y 和 N？

;WITH cte AS
(
 SELECT
   MAX(DATENAME(YEAR, order_date)) AS [YEAR]
  ,DATENAME(MONTH, order_date) AS [MONTH]
  ,MONTH(order_date) AS MONTHNR
  ,CASE WHEN A.ship_bill = 'Y' THEN COUNT(*) END AS SAME_BILL_SHIP
  ,CASE WHEN A.ship_bill = 'N' THEN COUNT(*) END AS DIFF_BILL_SHIP
 FROM x_master_order_tb O
  INNER JOIN tbl_Order_Addresses A
   ON A.addressID = O.addressid
 WHERE order_date BETWEEN '2014-01-01 00:00:00:000' AND GETDATE()
  AND wcs_status_id = 1
 GROUP BY
   DATENAME(MONTH, order_date)
  ,MONTH(order_date)
  ,A.ship_bill
)
SELECT
  YEAR
 ,MONTH
 ,MAX(SAME_BILL_SHIP) AS SAME_BILL_SHIP
 ,MAX(DIFF_BILL_SHIP) AS DIFF_BILL_SHIP
FROM cte
GROUP BY YEAR, MONTH, MONTHNR
ORDER BY MONTHNR

编辑：在GROUP BY 子句中添加了A.ship_bill。编辑：使用 CTE 您可以松开 NULL 行

【讨论】：

错误：Column 'tbl_Order_Addresses.ship_bill' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
DIFF_BILL_SHIP 也总是计算为 NULL，这不是这种情况
您的查询每个月生成两行，第一行为same_bill_ship 正确值，diff_bill_ship 为空，第二行相反。我们可以将这两个值放在一行中吗？
你必须PIVOT 的值，或者你可以通过使用 CTE 和“分组 NULLS”绕过它
您的查询现在可以工作了，我也使用 cte 编写了查询，但比您的要复杂一些。我们可以按月份对您的查询进行排序吗？

【解决方案2】：

您可以将 select 子句放在列列表中，这可以在同一行中为您提供 "same_bill_ship"、"diff_bill_ship"。看看这是否有帮助。

SELECT  MAX(DATENAME(YEAR, order_date)) AS [YEAR],
    DATENAME(MONTH, order_date) AS [MONTH],
    (SELECT COUNT(*) FROM FROM    x_master_order_tb O1 INNER JOIN tbl_Order_Addresses A1 ON A1.addressID = O1.addressid
        WHERE   order_date BETWEEN '2014-01-01 00:00:00:000' AND GETDATE() AND wcs_status_id = 1 AND A1.ship_bill = 'Y'
        GROUP BY    DATENAME(MONTH, order_date)),
    (SELECT COUNT(*) FROM FROM    x_master_order_tb O2 INNER JOIN tbl_Order_Addresses A2 ON A2.addressID = O2.addressid
        WHERE   order_date BETWEEN '2014-01-01 00:00:00:000' AND GETDATE() AND wcs_status_id = 1 AND A2.ship_bill = 'N'
        GROUP BY    DATENAME(MONTH, order_date))
FROM    x_master_order_tb O
INNER JOIN tbl_Order_Addresses A ON A.addressID = O.addressid
WHERE   order_date BETWEEN '2014-01-01 00:00:00:000' AND GETDATE() AND wcs_status_id = 1
GROUP BY    DATENAME(MONTH, order_date)

【讨论】：