Intermediate SQL tutorial demonstrating REGEXP for advanced filtering, IF & CASE statements to create categories, SUBQUERIES for complex analysis, and JOINS for combining multiple tables — all shown ...

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CREATE TABLE supplier (sup_id INTEGER PRIMARY KEY, sup_name TEXT, address TEXT); CREATE TABLE categories (cat_id INTEGER PRIMARY KEY, cat_name TEXT); CREATE TABLE employees (emp_id INTEGER PRIMARY KEY ...

As of October 2026, the most popular database management system (DBMS) worldwide was Oracle, with a ranking score of *****; MySQL and Microsoft SQL Server rounded out the top three. Although the ...

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