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.

Qlik is a software vendor specializing in data visualization, executive dashboards, and self-service business intelligence products, along with Tableau and Microsoft.

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