Question

我试图通过汇总桥表TransactionRecords的结果来更新Transactions表中的SubTotal字段。以下是我的表格。

|  Transaction  |
| ID | SubTotal |
| 1  |  ???     |
| 2  |  ???     |
| 3  |  ???     |


|     TransactionRecords                      |
| TransactionID | ProductID | QTY | SalePrice |
| 1             |  10       |  4  | 19.99     |
| 2             |  5        |  8  | 9.99      |
| 2             |  3        |  12 | 14.99     |

我想要的是Transaction.SubTotal等于TransactionRecords.SalePrice * TransactionRecords.QTY，其中TransactionRecords.TransactionID等于Transaction.ID

此查询：

select TransactionID, sum(UnitPrice * QuantitySold) 
from TransactionRecord 
group by TransactionID;

向我提供每笔交易中的每笔交易和销售金额，以及我希望交易表中包含的相应ID的值。

Answer 1

试试这个：

import matplotlib
import matplotlib.pyplot as plt
import seaborn as sns
from matplotlib.colors import LogNorm

fig = plt.figure()
ax1 = fig.add_subplot(1,1,1)
ax1.set_title("P-value")

Z1 = pos_spearmanr['pval']
X = pos_spearmanr['X']
Y = pos_spearmanr['Y']

im = ax1.scatter(X,
                 Y, 
                edgecolors=None,
                c=Z1,
                norm=LogNorm(),
                cmap=plt.get_cmap('bwr'), alpha=0.2)

ax1.set_xlabel('X')
ax1.set_ylabel('Y')
ax1.set_xlim(0, 1)
ax1.set_ylim(0, 1)
cbar = fig.colorbar(im,ax=ax1)

如何使用mysql

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