TAILIEUCHUNG - Chapter 3: SQL and QBE Transparencies

Purpose and importance of SQL, the main language for querying relational databases. How to retrieve data using the SELECT statement. How to insert data using the INSERT statement. How to update data using the UPDATE statement. How to delete data using the DELETE statement. About an alternative language for querying relational databases called QBE. | SQL and QBE Transparencies Chapter Name September 98 Chapter 3 - Objectives Purpose and importance of SQL, the main language for querying relational databases. How to retrieve data using the SELECT statement. How to insert data using the INSERT statement. How to update data using the UPDATE statement. How to delete data using the DELETE statement. About an alternative language for querying relational databases called QBE. Chapter Name September 98 Structured Query Language (SQL) Main language for relational DBMSs. Main characteristics: Relatively easy to learn Non-procedural - you specify what information you require, rather than how to get it Essentially free-format Consists of standard English words like SELECT, INSERT, and UPDATE Can be used by range of users. Chapter Name September 98 Structured Query Language (SQL) First and, so far, only standard database language to gain widespread acceptance. Huge investment from both vendors and users. Federal Information

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