mysql - 将独立选择查询的结果组合到一个表中

Question

我正在学习如何在 MySQL 中编写查询，我有一个包含事务的表并且想要得到总计 1。在整个生命周期内销售的收入，2。一天的收入，3。一周的收入 和 4。一个月的收入。所有这些都返回具有相同列的表。

所以我有两个表，一个是保存我所有交易的交易表，另一个是保存所有商品价格的价格表，当购买商品时，我从价格表中获取 itemid，这样我就可以获取一个商品的价格交易我需要加入这两个，这是我的表结构:

价格表

         |priceid | itemName | price |
         -----------------------------
         |1      |Bread     | 20    |

交易表

        |transactionid |pricefk |  transactiondate |
        --------------------------------------------
        |112           |1       |2018-03-22 19:15:05|       

我知道如何使用 3 个查询获取总收入、一天、一周和一个月的收入，但想要一种方法在一个查询中获取所有 3 个值

我知道的是

SELECT  SUM(p.price) as totalrevenue FROM transaction_table t JOIN price_tb p ON p.priceid = t.pricefk

获取所有生命周期的收入

SELECT  SUM(p.price) as totalrevenue FROM transaction_table t JOIN price_tb p ON p.priceid = t.pricefk  where t.transactiondate >= NOW() - INTERVAL 1 DAY

在一天内获得 yield

SELECT  SUM(p.price) as totalrevenue FROM transaction_table t JOIN price_tb p ON p.priceid = t.pricefk  where YEARWEEK(t.transactiondate)=YEARWEEK(NOW())

一周内获得 yield

SELECT  SUM(p.price) as totalrevenue FROM transaction_table t JOIN price_tb p ON p.priceid = t.pricefk  WHERE MONTH(t.transactiondate) = MONTH(CURRENT_DATE())
AND YEAR(t.transactiondate) = YEAR(CURRENT_DATE()) 

在一个月内获得收入

How can I combine all these queries in one query?

Answer 1

所有这些查询只返回一行，所以如果你需要在一行上的所有结果，你可以尝试使用交叉连接

  select t1.totalrevenue_lifetime, t2.totalrevenue_day, t3.totalrevenue_week , t4.totalrevenue_month
  from (
      SELECT  SUM(p.price) as totalrevenue_lifetime 
      FROM transaction_table t 
      JOIN price_tb p ON p.priceid = t.pricefk
  ) t1 
  CROSS JOIN (
    SELECT  SUM(p.price) as totalrevenue_day 
    FROM transaction_table t 
    JOIN price_tb p ON p.priceid = t.pricefk  
    where t.transactiondate >= NOW() - INTERVAL 1 DAY

  ) t2 
  CROSS JOIN (
    SELECT  SUM(p.price) as totalrevenue_week 
    FROM transaction_table t 
    JOIN price_tb p ON p.priceid = t.pricefk  
    where YEARWEEK(t.transactiondate)=YEARWEEK(NOW())
  ) t3
  CROSS JOIN (
      SELECT  SUM(p.price) as totalrevenue_month 
      FROM transaction_table t 
      JOIN price_tb p ON p.priceid = t.pricefk  
      WHERE MONTH(t.transactiondate) = MONTH(CURRENT_DATE())
      AND YEAR(t.transactiondate) = YEAR(CURRENT_DATE())
  ) t4