oracle advanced sql 高级SQL教程 ORACLE官方教材

Contents iii 3 Enhancements to the GROUP BY Clause Objectives 3-2 Review of Group Functions 3-3 Review of the GROUP BY Clause 3-4 Review of the HAVING Clause 3-5 GROUP BY with ROLLUP and CUBE Operators 3-6 ROLLUP Operator 3-7 ROLLUP Operator Example 3-8 CUBE Operator 3-9 CUBE Operator: Example 3-10 GROUPING Function 3-11 GROUPING Function: Example 3-12 GROUPING SETS 3-13 GROUPING SETS: Example 3-15 Composite Columns 3-17 Composite Columns: Example 3-19 Concatenated Groupings 3-21 Concatenated Groupings Example 3-22 Summary 3-23 Practice 3 Overview 3-24 4 Advanced Subqueries Objectives 4-2 What Is a Subquery? 4-3 Subqueries 4-4 Using a Subquery 4-5 Multiple-Column Subqueries 4-6 Column Comparisons 4-7 Pairwise Comparison Subquery 4-8 Nonpairwise Comparison Subquery 4-9 Using a Subquery in the FROM Clause 4-10 Scalar Subquery Expressions 4-11 Scalar Subqueries: Examples 4-12 Correlated Subqueries 4-14 Using Correlated Subqueries 4-16 Using the EXISTS Operator 4-18 Using the NOT EXISTS Operator 4-20 Correlated UPDATE 4-21 The WITH Clause 4-26 WITH Clause: Example 4-27 Summary 4-29 Practice 4 Overview 4-31 iv 5 Hierarchical Retrieval Objectives 5-2 Sample Data from the EMPLOYEES Table 5-3 Natural Tree Structure 5-4 Hierarchical Queries 5-5 Walking the Tree 5-6 Walking the Tree: From the Bottom Up 5-8 Walking the Tree: From the Top Down 5-9 Ranking Rows with the LEVEL Pseudocolumn 5-10 Formatting Hierarchical Reports Using LEVEL and LPAD 5-11 Pruning Branches 5-13 Summary 5-14 Practice 5 Overview 5-15 6 Oracle9i Extensions to DML and DDL Statements Objectives 6-2 Review of the INSERT Statement 6-3 Review of the UPDATE Statement 6-4 Overview of Multitable INSERT Statements 6-5 Types of Multitable INSERT Statements 6-7 Multitable INSERT Statements 6-8 Unconditional INSERT ALL 6-10 Conditional INSERT ALL 6-11 Conditional FIRST INSERT 6-13 Pivoting INSERT 6-15 External Tables 6-18 Creating an External Table 6-19 Example of Creating an External Table 6-20 Querying External Tables 6-23 CREATE INDEX with CREATE TABLE Statement 6-24 Summary 6-25 Practice 6 Overview 6-26 A Practice Solutions B Table Descriptions and Data C Writing Advanced Scripts D Oracle Architectural Components Index Additional Practices Additional Practice Solutions Additional Practices: Table Descriptions and Data