In SQL, a NULL value represents a missing or unknown data entry within a database. It is crucial to differentiate NULL from other values like zero or an empty string, as it specifically denotes the lack of data rather than a specific value. When a field is NULL, it indicates that no ...
从零开始学习 SQL - The Ultimate Guide to learn SQL from scratch [2023 Edition] 2022-4共计6条视频,包括:1. Introduction、1. MySQL Workbench Installation、1. Basics of Data Architecture等,UP主更多精彩视频,请关注UP账号。
Learn T-SQL From Scratch For SQL Server Administrator All the information needed within the courses to set yourself for a successful career as a SQL Production DBA评分:4.7,满分 5 分2790 条评论总共 9 小时63 个讲座初级 讲师: Raphael Asghar ...
An Easy-to-Follow Guide for Designing, Developing, and Deploying Databases in the SQL Server and Writing T-SQL Queries Efficiently
A lot of my colleagues and people in my network reached out to me to train them on the SQL Server and T-SQL. They think that my style of teaching and explaining the topic is unique and helps them understand the topic quickly. This really motivated me to take up a project of writing ...
CREATE OR REPLACE FUNCTION get_employee_salary(emp_id IN NUMBER) RETURN NUMBER AS v_salary NUMBER; BEGIN SELECT salary INTO v_salary FROM employees WHERE employee_id = emp_id; RETURN v_salary; END; Error Handling in PL/SQL Error handling is important for building reliable applications.Use th...
Since most users will be learning SQL to interact with an existing database, the lessons begin by introducing you to the various parts of an SQL query. The later lessons will then show you how to alter a table (or schema) and create new tables from scratch. ...
Master Database design and Data Storage for applications and websites in this comprehensive SQL and MYSQL online course. Database design is one of the most important aspects of Web programming. Successful implementation of any system with Data Storage will always need proper database design. In or...
Extracts insights from data to solve business problems and develop machine learning algorithms. Python, R, SQL, Machine Learning, AI concepts, statistical analysis, data visualization, communication Pandas, NumPy, Scikit-learn, Matplotlib, Tableau, Airflow, Spark, Git, Bash ...
For another way to describe an API, go to Create a custom connector from an OpenAPI definition.Note You can currently create a custom connector from scratch in Power Automate and Power Apps. For Logic Apps, you must start with at least a basic OpenAPI definition....