sql introduction课件.ppt

Chapter 3: Introduction to SQL;Chapter 3: Introduction to SQL;History;Data Definition Language;Domain Types in SQL;Create Table Construct;Integrity Constraints in Create Table;And a Few More Relation Definitions;And more still;Drop and Alter Table Constructs;Basic Query Structure ;The select Clause;The select Clause (Cont.);The select Clause (Cont.);The where Clause;The from Clause;Cartesian Product: instructor X teaches;Joins;Try Writing Some Queries in SQL;Natural Join;Natural Join Example;Natural Join (Cont.);The Rename Operation;String Operations;String Operations (Cont.);Ordering the Display of Tuples;Where Clause Predicates;Duplicates;Duplicates (Cont.);Set Operations;Set Operations;Null Values;Null Values and Three Valued Logic;Aggregate Functions;Aggregate Functions (Cont.);Aggregate Functions – Group By;Aggregation (Cont.);Aggregate Functions – Having Clause;Null Values and Aggregates;Nested Subqueries;Example Query;Example Query;Set Comparison;Definition of Some Clause;Example Query;Definition of all Clause;Test for Empty Relations;Correlation Variables;Not Exists;Test for Absence of Duplicate Tuples;Subqueries in the From Clause;Subqueries in the From Clause (Cont.);With Clause;Complex Queries using With Clause;Scalar Subquery;Modification of the Database;Modification of the Database – Deletion;Deletion (Cont.);Modification of the Database – Insertion;Insertion (Cont.);Modification of the Database – Updates;Case Statement for Conditional Updates;Updates with Scalar Subqueries;End of Chapter 3;Advanced SQL Features**;Figure 3.02;Figure 3.03;Figure 3.04;Figure 3.05;Figure 3.07;Figure 3.08;Figure 3.09;Figure 3.10;Figure 3.11;Figure 3.12;Figure 3.13;Figure 3.16;Figure 3.17