我对MySQL有疑问。我有3张桌子：
新订单表：
+------------+---------+----------+------------+---------------+-----------+----------+-----------+----------+------+----------+------------+-----------+
| neworderid | orderno | customer | date | stocklocation | product | quantity | unitprice | discount | tax | total | grandtotal | status |
+------------+---------+----------+------------+---------------+-----------+----------+-----------+----------+------+----------+------------+-----------+
| ORD001 | ORD-001 | abc | 2018-02-27 | Bangalore | sssssssss | 2 | 28000 | 2 | 18 | 64758.4 | 0 | Approved |
| ORD002 | ORD-002 | abc | 2018-03-05 | Bangalore | sssssssss | 8 | 28000 | 2 | 18 | 259033.6 | 0 | Approved |
| ORD003 | ORD-003 | hhh | 2018-03-05 | Haveri | sssssssss | 2 | 28000 | 50 | 30 | 36400 | 0 | Cancelled |
+------------+---------+----------+------------+---------------+-----------+----------+-----------+----------+------+----------+------------+-----------+
addproductfromsupplier：
+-------------------+-----------+------------+--------------+---------------+---------------------------------------------------------------------------+-------------+----------+-----------+-------+-------------+------------+-------------+
| supplierproductid | invoiceno | date | suppliername | stocklocation | address | productname | quantity | unitprice | tax | total | grandtotal | status |
+-------------------+-----------+------------+--------------+---------------+---------------------------------------------------------------------------+-------------+----------+-----------+-------+-------------+------------+-------------+
| SUPR001 | CM-001 | 2018-02-12 | COMPANY1 | Bangalore | AAAAAASSSSSSDDDDD | sssssssss | 10 | 2500.00 | 5.00 | 26250.0000 | NULL | received |
| SUPR002 | CM-001 | 2018-02-12 | COMPANY1 | Bangalore | AAAAAASSSSSSDDDDD | sssss | 10 | 1000.00 | 6.00 | 10600.0000 | NULL | received |
| SUPR003 | INC-001 | 2017-05-07 | eeee | Bangalore | qqqq | sssssssss | 5 | 28000.00 | 18.00 | 165200.0000 | NULL | notreceived |
| SUPR004 | INV-0001 | 2018-03-17 | hh | Haveri | AAAAAAA | sssssssss | 2 | 28000.00 | 18.00 | 66080.0000 | NULL | notreceived |
+-------------------+-----------+------------+--------------+---------------+---------------------------------------------------------------------------+-------------+----------+-----------+-------+-------------+------------+-------------+
费用表：
+-----------------+------------+--------+
| description | date | amount |
+-----------------+------------+--------+
| office Cleaning | 2018-03-17 | 500 |
+-----------------+------------+--------+
我无法正确查询查询：
select sum(A.total) as totalsales
, sum(B.total) as totalpurchase
, (sum(A.total)-sum(B.total)) as grossprofit
, sum(C.amount) as expence
, ((sum(A.total)-sum(B.total))-sum(C.amount)) as netprofit
from newordertable A
, addproductfromsupplier B
, expensetable C
where A.date between '2018-3-05' and '2018-3-18'
and B.date between '2018-3-05' and '2018-3-18'
and C.date between '2018-3-05' and '2018-3-18';
+------------+---------------+--------------------+---------+--------------------+
| totalsales | totalpurchase | grossprofit | expence | netprofit |
+------------+---------------+--------------------+---------+--------------------+
| 295433.6 | 132160.0000 | 163273.59999999998 | 1000 | 162273.59999999998 |
+------------+---------------+--------------------+---------+--------------------+
答案 0 :(得分：0)
没有冒犯，但这显示了对连接如何工作和执行顺序的误解。 如果我们从这个
中取出总和并过滤掉select *
from A
, B
, C
we get
+------------+-----------+------------+-----------+------------+--------+
| dte | total | dte | total | dte | amount |
+------------+-----------+------------+-----------+------------+--------+
| 2018-02-27 | 64758.40 | 2018-02-12 | 26250.00 | 2018-03-17 | 500.00 |
| 2018-03-05 | 259033.60 | 2018-02-12 | 26250.00 | 2018-03-17 | 500.00 |
| 2018-03-05 | 36400.00 | 2018-02-12 | 26250.00 | 2018-03-17 | 500.00 |
| 2018-02-27 | 64758.40 | 2018-02-12 | 10600.00 | 2018-03-17 | 500.00 |
| 2018-03-05 | 259033.60 | 2018-02-12 | 10600.00 | 2018-03-17 | 500.00 |
| 2018-03-05 | 36400.00 | 2018-02-12 | 10600.00 | 2018-03-17 | 500.00 |
| 2018-02-27 | 64758.40 | 2017-05-07 | 165200.00 | 2018-03-17 | 500.00 |
| 2018-03-05 | 259033.60 | 2017-05-07 | 165200.00 | 2018-03-17 | 500.00 |
| 2018-03-05 | 36400.00 | 2017-05-07 | 165200.00 | 2018-03-17 | 500.00 |
| 2018-02-27 | 64758.40 | 2018-03-17 | 66080.00 | 2018-03-17 | 500.00 |
| 2018-03-05 | 259033.60 | 2018-03-17 | 66080.00 | 2018-03-17 | 500.00 |
| 2018-03-05 | 36400.00 | 2018-03-17 | 66080.00 | 2018-03-17 | 500.00 |
+------------+-----------+------------+-----------+------------+--------+
12 rows in set (0.00 sec)
带过滤器
select *
from A
, B
, C
where A.dte between '2018-3-05' and '2018-3-18'
and B.dte between '2018-3-05' and '2018-3-18'
and C.dte between '2018-3-05' and '2018-3-18';
我们得到了
+------------+-----------+------------+----------+------------+--------+
| dte | total | dte | total | dte | amount |
+------------+-----------+------------+----------+------------+--------+
| 2018-03-05 | 259033.60 | 2018-03-17 | 66080.00 | 2018-03-17 | 500.00 |
| 2018-03-05 | 36400.00 | 2018-03-17 | 66080.00 | 2018-03-17 | 500.00 |
+------------+-----------+------------+----------+------------+--------+
2 rows in set (0.00 sec)
这是预期的行为，但不是你想要的 在
中添加总和select sum(A.total) as totalsales
, sum(B.total) as totalpurchase
, (sum(A.total)-sum(B.total)) as grossprofit
, sum(C.amount) as expence
, ((sum(A.total)-sum(B.total))-sum(C.amount)) as netprofit
from A
cross join B
cross join C
where A.dte between '2018-3-05' and '2018-3-18'
and B.dte between '2018-3-05' and '2018-3-18'
and C.dte between '2018-3-05' and '2018-3-18';
我们得到了
+------------+---------------+-------------+---------+-----------+
| totalsales | totalpurchase | grossprofit | expence | netprofit |
+------------+---------------+-------------+---------+-----------+
| 295433.60 | 132160.00 | 163273.60 | 1000.00 | 162273.60 |
+------------+---------------+-------------+---------+-----------+
1 row in set (0.00 sec)
一种方法可能是将总位包装在子查询中，然后执行其他位，例如
select Atotal as totalsales
, Btotal as totalpurchase
, Atotal-Btotal as grossprofit
, Camount as expence
, Atotal - Btotal - camount as netprofit
from
(
select (select sum(a.total) from a where A.dte between '2018-3-05' and '2018-3-18' ) atotal,
(select sum(b.total) from b where b.dte between '2018-3-05' and '2018-3-18' ) btotal,
(select sum(c.amount) from c where c.dte between '2018-3-05' and '2018-3-18' ) camount
from dual
) s
+------------+---------------+-------------+---------+-----------+
| totalsales | totalpurchase | grossprofit | expence | netprofit |
+------------+---------------+-------------+---------+-----------+
| 295433.60 | 66080.00 | 229353.60 | 500.00 | 228853.60 |
+------------+---------------+-------------+---------+-----------+
1 row in set (0.00 sec)