'Select avg price' diaporamas de présentation

SQL, RA, Sets, Bags

SQL, RA, Sets, Bags. Fundamental difference between theoretical RA and practical application of it in DBMSs and SQL RA ? uses sets SQL ? uses bags ( multisets ) There are good performance reasons for using bags:

733 views • 52 slides

Introduction to SQL

434 views • 37 slides

ITEC 334 Fall 2010 Online (Business) Application Development

ITEC 334 Fall 2010 Online (Business) Application Development. Database Review Professor J. Alberto Espinosa. Agenda. Quick review of database design concepts Quick review of SQL SELECT command for queries Learn SQL DELETE, INSERT and UPDATE commands

391 views • 27 slides

ITEC 334 Fall 2010 Online (Business) Application Development

ITEC 334 Fall 2010 Online (Business) Application Development. Database Review Professor J. Alberto Espinosa. Agenda. Quick review of database design concepts Quick review of SQL SELECT command for queries Learn SQL DELETE, INSERT and UPDATE commands

273 views • 27 slides

CS411 Database Systems

CS411 Database Systems. Kazuhiro Minami. 06: SQL. Join Expressions. Join Expressions. SQL provides a number of expression forms that act like varieties of join in relational algebra. But using bag semantics, not set semantics.

334 views • 24 slides

Lecture 4: Advanced SQL

Lecture 4: Advanced SQL. INTERSECT and EXCEPT: (missing from MySQL ). (SELECT R.A, R.B FROM R) INTERSECT (SELECT S.A, S.B FROM S). SELECT R.A, R.B FROM R WHERE EXISTS ( SELECT * FROM S WHERE R.A=S.A and R.B=S.B). (SELECT R.A, R.B FROM R) EXCEPT (SELECT S.A, S.B

281 views • 21 slides

Lecture 4: Advanced SQL

Lecture 4: Advanced SQL. INTERSECT and EXCEPT: (missing from MySQL ). (SELECT R.A, R.B FROM R) INTERSECT (SELECT S.A, S.B FROM S). SELECT R.A, R.B FROM R WHERE EXISTS ( SELECT * FROM S WHERE R.A=S.A and R.B=S.B). (SELECT R.A, R.B FROM R) EXCEPT (SELECT S.A, S.B

295 views • 21 slides

Schedule

Schedule. Today (T) Duplicates, Aggregation, Modifications. Read Sections 5.3-5.4, 6.4-6.5. Assignment 3 due. Oct. 18 (TH) Schemas, Views. Read Sections 6.6-6.7. Project Part 3 due. Oct. 23 (T) Constraints. Read Sections 7.1-7.2. Assignment 4 due. Reminder: Midterm is Nov. 1 (TH).

250 views • 18 slides

Union, Intersection, Difference

382 views • 17 slides

CS122 Using Relational Databases and SQL Subqueries and Set Operations

CS122 Using Relational Databases and SQL Subqueries and Set Operations. Chengyu Sun California State University, Los Angeles. Query Results. Query results are either a table or a value * E.g. select * from products or select count(*) from products

179 views • 17 slides

CS122 Using Relational Databases and SQL Subqueries and Set Operations

CS122 Using Relational Databases and SQL Subqueries and Set Operations. Chengyu Sun California State University, Los Angeles. Query Results. Query results are either a table or a value * E.g. select * from products or select count(*) from products

132 views • 13 slides

CS122 Using Relational Databases and SQL Subqueries and Set Operations

CS122 Using Relational Databases and SQL Subqueries and Set Operations. Chengyu Sun California State University, Los Angeles. Query Results. Query results are either a table or a value * E.g. select * from products or select count(*) from products

135 views • 13 slides

SQL Practice: Henry Books Case

SQL Practice: Henry Books Case. Yong Choi BPA CSUB. SQL 1. Q 1 SELECT BookCode, Title FROM Book; Q 2 SELECT * FROM Publisher; Q 3 SELECT PublisherName FROM Publisher WHERE City='New York';. SQL 2. Q 4 SELECT PublisherName FROM Publisher WHERE NOT City='New York'; Q 5

141 views • 8 slides