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`

第二个查询:

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` 

我如何将这些放在一起。我还在学习，所以请尽可能简单!谢谢

Answer 1

试试这个..

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`