What is SQL Lectures on Database TechnologySQL(pronounced ess-que-el) stands for Structured Query LanguageSQL is used tomunicate with a database SQLAccording to ANSI (American National Standards I
Software Engineering MathematicsZhu HuibiaoSoftware Engineering InstituteEast China Normal UniversityTextbookBook name:Discrete Mathematicsand Its Applications (Sixth Edition)Author:Kenneth H Rosen (A
Chapter 1Introduction11 Introduction to Object Oriented12Introduction to UML13Software Process and OOA&D 14Patterns and Architecture11 Introduction to Object-Oriented OO Programming (proceduralVS OO)
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Chapter 1:IntroductionWhere is DatabaseWhere is DatabaseWhere is DatabaseWhere is DatabaseWhere is Database琐言碎语数据库系统的地位数据库技术产生于六十年代末,是数据管理的最新技术,是计算机科学的重要分支数据库系统与操作系统一样是计算机系统的基础软件,也称为系统软件、平台软件。它的出现极大地促
6/28/20241SQL(4)GROUP BY clause 6/28/20242GROUP BY clause The GROUP BY clause will gather all of the rows together that contain data in the specified column(s) and will allow aggregate functions to
6/28/20241SQL(5)6/28/20242HAVING clause The HAVING clause allows you to specify conditions on the rows for each group - in other words, which rows should be selected will be based on the conditions yo
6/28/20241SQL(6)Table Joins, a must 6/28/20242Table Joins, a must All of the queries up until this point have been useful with the exception of one major limitation - that is, you've been selecting fr
2024-06-281SQL(2)2024-06-282SELECT StatementThe SELECT statement is used to query the database and retrieve selected data that match the criteria that youStatement The SELECT statement has five main c
2024-06-281SQL(3)Aggregate Functions 2024-06-282Aggregate Functions2024-06-283Aggregate Functions Aggregate functions are used topute against a returned column of numeric data from your SELECT s
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