SQL or Structured Query Language, is a programming language designed for managing and querying relational databases. It allows you to create, read, update, and delete data in databases, making it essential for working with data-driven systems. It forms the backbone of most modern applications, ma...
SQL Interview Question 面试的时候发现会问一些SQL的基本问题,在此总结一下。 ProgramInterview/SQL这个网站上的问题还比较全。 1. Join type INNER JOIN: Returns all rows when there is at least one match in BOTH tables LEFT JOIN: Return all rows from the left table, and the matched rows from the...
Here’s thelinkto the question if you want to follow along with me. Technical Concepts Doing data analysis in Python is one of the much appreciated, often mandatory, skills for data analysts. While Python offers a lot of possibilities for data analysis, this usually isn’t enough. You’ll ...
A table may have an index for columns in question. In such cases, MySQL can swiftly decide the position to find out in the data file’s centre without looking through all data. This process is quite faster than reading each row sequentially. 30.Why is MySQL better than other databases?
Interview question - Order Process AutomationAn ecommerce transaction starts on an instance of SAP Hybris at the frontend (browser-based). The order then flows through a bespoke SQL Server based Data Hub, into MS Dynamics 365 (F&O), where the order orchestrated. The flow also includes ...
This repo is a collection of all the Interview Query's SQL interview question. - GitHub - nehanawar025/interview_query_SQL: This repo is a collection of all the Interview Query's SQL interview question.
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The left anti semi join is a logical operator (read: you’ll see it referred to in the execution plan, but there is no explicit T-SQL equivalent) which returns each row from the first (top) input when there is no matching row in the second (bottom) input. If ...
The question from LeetCode asks you the following. “Write an SQL query to report the respective department name and number of students majoring in each department for all departments in theDepartmenttable (even ones with no current students).Return the result tableorderedby student_numberin descen...
For this example, we’ll assume the interviewer asked you to design Twitter, or X.com as it now is. Here are some considerations for answering this question: Ask clarifying questions Is the interviewer looking for a design of the core features, or a high-level overview of the whole ...