From software engineering to data analytics, HackerRank is one of the best platforms for practicing coding interview questions.HackerRank’s SQL practicesuite has hundreds of questions available for you to practice. You can filter the questions by their difficulty levels: easy, medium, and hard. Alt...
Python Best Practices for More Pythonic Code The articles and tutorials in this section contain best practices and other “nuggets of wisdom” to help your write better, more idiomatic, and more Pythonic code. Here you’ll find specific resources that will teach you how to idiomatically use ...
Back To Basics, Part Uno: Linear Regression and Cost Function Data Science An illustrated guide on essential machine learning concepts Shreya Rao February 3, 2023 6 min read Must-Know in Statistics: The Bivariate Normal Projection Explained
# pys ="".join(["Life","is","short","I","love","Python"])# betters ="Life"+"is"+"short"+"I"+"love"+"Python"# worse in的使用 # 尽可能的使用in,使用__contains__支持in,加上使用__iter__,可以支持for x in yforkeyind:print(key)# betterforkeyind.keys():print(key)# worse...
def execute(self,sql:str, args = ()): #dml with self.pool.connection() as conn: cursor = conn.cursor() cursor.execute(sql,args) conn.commit() 测试目标是Db.execute 和Db.rawQuery, 单元测试的test case可以用sqlite3的memory database去patch实际的mysql,业务对象最终会调用这些数据操作函数。
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The application must be able to create the connection string and attach the database to SQL Server 2008 Express through code (C#) b) The application must be able to retrieve (again through code) a list with all the available databases, to give the user a chance to select one to open. ...
Describe the basics of the Structured Query Language (SQL) and database design for storing data Understand fundamental programming concepts such as data structures Use the Python built-in data structures such as lists, dictionaries, and tuples to perform increasingly complex data analysis Duration : ...
Foundational R programming skills (a required skill in over 65% data science jobs) Learn Statistical concepts such as probability, Statistical tools such as inference and modeling and how to apply them in practice Gain experience with the tidyverse, including data visualization with ggplot2 and data...
Toad for SQL Server Visual Expert The increasing popularity of MySQL means that everyone needs effective, convenient and affordable database tools to work with it. However, as a DBA, your goal shouldn’t be to access as many clients as possible, but to choose one that offers a wholesome sol...