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Advanced Subqueries

Advanced Subqueries

Advanced Subqueries. Objectives. After completing this lesson, you should be able to do the following: Write a multiple-column subquery Describe and explain the behavior of subqueries when null values are retrieved Write a subquery in a FROM clause Use scalar subqueries in SQL

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551 views • 43 slides
Chapter 8

Chapter 8

Chapter 8. Advanced SQL Database Systems: Design, Implementation, and Management, Seventh Edition, Rob and Coronel. In this chapter, you will learn:. About the relational set operators UNION, UNION ALL, INTERSECT, and MINUS How to use the advanced SQL JOIN operator syntax

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343 views • 34 slides
Oracle11 g : SQL

Oracle11 g : SQL

Oracle11 g : SQL. Chapter 12 Subqueries and Merge Statements. Objectives. Determine when using a subquery is appropriate Identify which clauses can contain subqueries Distinguish between an outer query and a subquery Use a single-row subquery in a WHERE clause

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511 views • 33 slides
Advanced Subqueries

Advanced Subqueries

Advanced Subqueries. Objectives. After completing this lesson, you should be able to do the following: Write a multiple-column subquery Describe and explain the behavior of subqueries when null values are retrieved Write a subquery in a FROM clause Use scalar subqueries in SQL

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481 views • 29 slides
SQL Server Performance Tuning

SQL Server Performance Tuning

The most challenging aspect of a website is Database performance if it is poorly constructed.It is the high time to tune your SQL Server Performance!This ppt contains 18 golden Tips to improve the performance of your SQL Server.

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426 views • 20 slides
Access Path Selection in a Relational Database Management System

Access Path Selection in a Relational Database Management System

Access Path Selection in a Relational Database Management System. Selinger et al. Query Optimization. Declarative query language relieves programmer of the burden to choose an access plan. Difference between good and bad access plans can be several orders of magnitude.

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252 views • 19 slides
Chapter 7 Subqueries

Chapter 7 Subqueries

Chapter 7 Subqueries. Subquery. Used when query is based on unknown value A query nested inside another query Requires SELECT and FROM clauses Must be enclosed in parentheses Place on right side of comparison operator. Types of Subqueries. Single-Row Subquery Operators.

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258 views • 14 slides
Chapter 7 Subqueries

Chapter 7 Subqueries

Chapter 7 Subqueries. Subquery. Used when query is based on unknown value A query nested inside another query Requires SELECT and FROM clauses Must be enclosed in parentheses Place on right side of comparison operator. Types of Subqueries. Single-Row Subquery Operators.

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269 views • 14 slides

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