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本篇笔记主要分为两部分: 1,安装完毕之后的简单配置 2,数据的类型、简单的数据表操作命令 一、mysql安装完毕之后 windows和linux环境,除mysql的安装、配置有所不同,其他操作一样,本文在linux环境下操作。 启动(停止,重启)mysql服务: service mysql sta 阅读全文
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183. Customers Who Never Order Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all cus 阅读全文
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1、176题目,Second Highest Salary,https://leetcode.com/problems/second-highest-salary/#/description Write a SQL query to get the second highest salary fro 阅读全文
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import pandas as pd import numpy as np import matplotlib.pyplot as plt data = pd.read_csv(r"C:\Users\Oscar\Downloads\Advertising.csv") x = data[["TV","Radio","Newspaper"]] y=data["Sales"] plt.plot(d... 阅读全文