'Outer query' diaporamas de présentation

SQL Unit 9 Correlated Subqueries

SQL Unit 9 Correlated Subqueries. Kirk Scott. 9.1 Correlated Subqueries 9.2 EXISTS 9.3 NOT EXISTS 9.4 Double NOT EXISTS. 9.1 Correlated Subqueries. 1. Recall how subqueries with IN work. There is an inner query and an outer query.

1.25k views • 112 slides

Chapter 12 Subqueries and Merge Statements (up to p.451)

783 views • 55 slides

Chapter 7: advanced sql

Modern Database Management. Chapter 7: advanced sql. Define terms Write single and multiple table SQL queries Define and use three types of joins Write noncorrelated and correlated subqueries Understand and use SQL in procedural languages (e.g. PHP, PL/SQL)

839 views • 44 slides

Structured Query Language (2)

Structured Query Language (2). The main reference of this presentation is the textbook and PPT from : Elmasri & Navathe, Fundamental of Database Systems, 4 th edition, 2004, Chapter 8

536 views • 43 slides

Tutorial 12 Managing and Securing a Database

Tutorial 12 Managing and Securing a Database. Objectives. Filter data in a table and a form Save a filter as a query and apply the saved query as a filter Create a subquery Create a multivalued field Create an Attachment field Use an AutoNumber field

541 views • 40 slides

Chapter 5 More SQL: Complex Queries, Triggers, Views, and Schema Modification

Chapter 5 More SQL: Complex Queries, Triggers, Views, and Schema Modification. Chapter 5 Outline. More Complex SQL Retrieval Queries Specifying Constraints as Assertions and Actions as Triggers Views (Virtual Tables) in SQL Schema Change Statements in SQL. More Complex SQL Retrieval Queries.

502 views • 39 slides

Chapter 7 SQL HUANG XUEHUA

Chapter 7 SQL HUANG XUEHUA. SET OPERATIONS. except. SQL has directly incorporated some set operations There is a union operation ( UNION) , and in some versions of SQL there are set difference ( MINUS) and intersection ( INTERSECT) operations

432 views • 36 slides

Processing Nested Complex Sequence Pattern Queries over Event Streams

Processing Nested Complex Sequence Pattern Queries over Event Streams. Mo Liu 1 , Medhabi Ray 1 , Elke A. Rundensteiner 1 , Dan Dougherty 1 , Chetan Gupta 2 , Song Wang 2 , Ismail Ari 3 , and Abhay Mehta 2 1 Worcester Polytechnic Institute, USA 2 HP Labs, USA 3 Ozyegin University, Turkey

539 views • 34 slides

Query Optimization and Intro to Transactions

Query Optimization and Intro to Transactions. R&G, Chapter 15 Chapter 16 Lecture 18. Administrivia. Homework 3 due next Tuesday, March 20 by end of class period Homework 4 available on class website Implement nested loops and hash join operators for (new!) minibase

426 views • 33 slides

CSC443

CSC443. Integrity Set operations List operations. Review. Commands: Create Drop Alter Insert Select. Syllabus. New syllabus in course info Reading this week - 4.1-3; 8.6-8; finishing chap 3 Test: mostly on executing sql statements. Integrity - Primary key.

374 views • 30 slides

Chapter 12

Chapter 12. Subqueries. Subquery. A subquery is a query embedded in another query Needed because result of a subquery is used to perform another query Frequently used to compare a field to the result of an aggregate function

310 views • 24 slides

Fundamentals of Database Systems Fourth Edition El Masri & Navathe Instructor: Mr. Ahmed Al Astal

Fundamentals of Database Systems Fourth Edition El Masri & Navathe Instructor: Mr. Ahmed Al Astal. Chapter 8 ( Cont .) SQL-99: Schema Definition, Basic Constraints, and Queries. SQL: USE OF DISTINCT To eliminate duplicate tuples in a query result, the keyword DISTINCT is used

413 views • 23 slides

Chapter 7 Subqueries

Chapter 7 Subqueries. Chapter Objectives. Determine when it is appropriate to use a subquery Identify which clauses can contain subqueries Distinguish between an outer query and a subquery Use a single-row subquery in a WHERE clause Use a single-row subquery in a HAVING clause

496 views • 23 slides

Fundamentals of Database Systems Fourth Edition El Masri & Navathe

University Of Palestine. Fundamentals of Database Systems Fourth Edition El Masri & Navathe. Chapter 8 (Cont.) SQL-99: Schema Definition, Basic Constraints, and Queries. Database Management CH 8. University Of Palestine. SQL: USE OF DISTINCT

879 views • 22 slides

Database Management Systems

Database Management Systems. NESTING OF QUERIES. Some queries require that existing values in the database be retrieved and then used in a comparison condition. A complete SELECT query, called a nested query , can be specified within the WHERE-clause of another query, called the outer query

355 views • 17 slides

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.

258 views • 14 slides

Module 6: Working with Subqueries

Module 6: Working with Subqueries. Overview. Introduction to Subqueries Using a Subquery as a Derived Table Using a Subquery as an Expression Using a Subquery to Correlate Data Using the EXISTS and NOT EXISTS Clauses. Introduction to Subqueries. Why to Use Subqueries

271 views • 13 slides

SQL -- SubSelects

SQL -- SubSelects. SQL -- SubSelects. SQL -- SubSelects. SQL -- SubSelects. SQL -- SubSelects. Data Manipulation includes hot topic -- sub-selects !. Sub-selects or subqueries as they are sometimes called: - SQL expressions that begin with the SELECT

265 views • 11 slides

Advanced SQL

166 views • 10 slides

ITE 370: Nested Queries

ITE 370: Nested Queries. Jeffrey P. Landry University of South Alabama. Nested Query-Defined. A nested query is a query within a query A complete SELECT statement embedded within another SELECT statement Nested queries are also called subqueries. Query Results.

195 views • 9 slides