Comprehensive SQL Command Reference

Structured Query Language (SQL), a standard language for database interaction. It meticulously details various SQL commands, categorizing them into DDL for structure definition, DML for data manipulation, DCL for access control, TCL for transaction management, and DQL for data retrieval. The document further explains fundamental SQL operations like creating and modifying tables, inserting, updating, and deleting data, alongside querying techniques using SELECT statements with clauses such as WHERE, ORDER BY, and GROUP BY. Moreover, it elucidates advanced concepts including joins for combining tables, constraints for data integrity, the handling of NULL values, and the use of views as virtual tables, ultimately offering a thorough overview of essential SQL functionalities for database management and querying.