SQL (Structured Query Language) is the standard operation language for relational databases, used for data query, insert, update, and delete operations. As the core technology of database management, SQL is widely used in data analysis, business intelligence, ETL processing, and data warehouse construction. It's an essential skill tool for data professionals.

JSON (JavaScript Object Notation) is the standard table data format for modern web applications, REST APIs, and microservice architectures. Its clear structure and efficient parsing make it widely used in front-end and back-end data interaction, configuration file storage, and NoSQL databases. Supports nested objects, array structures, and multiple data types, making it indispensable table data for modern software development.

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