使用sum和count mysql查询连接

Question

我有这样的示例数据：

trancation-A

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

trancation-B

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

参数日期=＆＃39; 2014-08-16＆＃39;

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'

还是错的...... 请帮帮我....

Answer 1

在 join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;