'Sailors s' diaporamas de présentation

Administrative

Administrative. Exam Oct 19, 2010 2:30pm in 3005 (usual room) No class on Oct 21 What topic to do for review? November 18 th away for conference. Database Systems I Week 5 SQL Queries. Introduction. We now introduce SQL, the standard query language for relational DBS.

703 views • 51 slides

Relational Query Optimization

596 views • 50 slides

SQL: Queries, Constraints, Triggers

SQL: Queries, Constraints, Triggers. Chapter 5. SQL . Data Manipulation Language (DML): subset of SQL which allows users to create queries and to insert , delete and modify rows .

567 views • 41 slides

Math in SQL

Math in SQL. Aggregation Operators. Operators on sets of tuples. Significant extension of relational algebra. SUM ( [DISTINCT] A) : the sum of all (unique) values in attribute A. AVG ( [DISTINCT] A): the average of all (unique) values in attribute A . SELECT AVG ( S.age )

374 views • 26 slides

SQL: Constraints, Triggers, Embedded SQL

SQL: Constraints, Triggers, Embedded SQL. Chapters: 5, 6. Overview. Concepts covered in this lecture: Constraints Triggers SQL in application code Embedded SQL Cursors Dynamic SQL Stored procedures. Integrity Constraints (Review).

331 views • 21 slides

ICS 421 Spring 2010 Relational Query Optimization

ICS 421 Spring 2010 Relational Query Optimization. Asst. Prof. Lipyeow Lim Information & Computer Science Department University of Hawaii at Manoa. Query Optimization. Query. Parse Query. Two main issues: For a given query, what plans are considered ?

263 views • 12 slides