MySQL将两个查询组合在一起

Question

这是我的第一个问题，我仍在学习Mysql，所以我遇到的问题是将两个查询组合在一起

第一个查询：

SELECT
     stocks.Stock_Trans_No
     stocks.Stock_Date_Time,
     stocks.Stock_Trans_Type,
     stocks.Stock_Trans_Ref_No,
     stocks.Stock_Trans_Item_Code,
     stocks.Stock_Trans_Qty,
     stocks.Item_Description

FROM stocks

WHERE

DATE_FORMAT( stocks.Stock_Date_Time, '%Y%m%d') BETWEEN   DATE_FORMAT('2015-09-01', '%Y%m%d') AND   DATE_FORMAT('2015-11-01', '%Y%m%d')  GROUP BY   stocks.`Stock_Trans_Item_Code`

第二查询：

SELECT 
SUM( stocks.Stock_Trans_Qty) 
FROM  stocks
WHERE 
DATE_FORMAT( stocks.Stock_Date_Time, '%Y%m%d') > '2015-09-01' 
GROUP BY stocks.`Stock_Trans_Item_Code` 

我如何将它们融合在一起。 我仍在学习，因此请尽量简单一点！ 谢谢

Answer 1

尝试这个..

SELECT
SUM( IF(DATE_FORMAT( stocks.Stock_Date_Time, '%Y%m%d') > '2015-09-01',stocks.Stock_Trans_Qty,0)) AS Stock_Trans_Qty_Sum
 stocks.Stock_Trans_No
 stocks.Stock_Date_Time,
 stocks.Stock_Trans_Type,
 stocks.Stock_Trans_Ref_No,
 stocks.Stock_Trans_Item_Code,
 stocks.Stock_Trans_Qty,
 stocks.Item_Description
FROM stocks
WHERE
DATE_FORMAT( stocks.Stock_Date_Time, '%Y%m%d') BETWEEN   DATE_FORMAT('2015-09-01', '%Y%m%d') AND   DATE_FORMAT('2015-11-01', '%Y%m%d')  GROUP BY   stocks.`Stock_Trans_Item_Code`

Answer 2

试试这个

SELECT s1.*,
(SELECT SUM(s2.Stock_Trans_Qty)
 FROM stocks as s2
 WHERE
  s2.Stock_Trans_Item_Code = s1.Stock_Trans_Item_Code AND
  DATE_FORMAT(s2.Stock_Date_Time, '%Y%m%d') > '2015-09-01'
 ) Total
FROM stocks as s1
WHERE
 DATE_FORMAT(s1.Stock_Date_Time, '%Y%m%d') BETWEEN DATE_FORMAT('2015-09-01', '%Y%m%d') AND DATE_FORMAT('2016-11-01', '%Y%m%d')
GROUP BY s1.`Stock_Trans_Item_Code`