mysql - 使用 sum 和 count mysql 进行查询连接

Question

我有一个这样的示例数据:

交易-A

=========================
    date        price
=========================
2014-08-16     50000
2014-08-17     60000
2014-08-16     60000    

交易-B

=========================
    date        price
=========================
2014-08-16     75000
2014-08-17     90000
2014-08-18     70000    

当参数date='2014-08-16'时

我想要这样的结果:

=================================
totalA   priceA   totalB  priceB
=================================
2 Unit   110000   1 Unit  75000

我运行我的查询:

select count(A.price)as totalA, sum(A.price)as priceA, 
count(B.price)as totalB,      sum(B.price)as priceB
from t_penjualan as A join t_pembelian as B
where A.tgl_transaksi = '2014-08-16' and B.tgl_transaksi = '2014-08-16'

还是错了... 请帮助我......

Answer 1

在加入之前进行聚合:

select totalA, priceA, totalB, priceB
from (select count(A.price)as totalA, sum(A.price)as priceA
      from t_penjualan A
      where A.tgl_transaksi = '2014-08-16'
     ) A cross join
     (select count(B.price)as totalB, sum(B.price)as priceB
      from t_pembelian as B
      where B.tgl_transaksi = '2014-08-16'
     ) B;