Improved Query Speed- processing optimizations supported by in-database analytics enable significantly better query performance. Actions which before required self-joins or complex procedural processing may now be performed in native SQL. Improved Manageability- ability to access a consolidated view of all...
Transactions Address two issues: Access by multiple users Remember the “client-server” architecture: one server with many clients Protection against crashes Multiple users: single statements Client 1: UPDATE Product SET Price = Price – 1.99 WHERE pname = ‘Gizmo’ Client 2: UPDATE Product SET ...
Introduction to SQL Part III COSC 3480 Teaching Plan Part SQL in 45 Minutes (Chapter 5) Relational Algebra (Chapter 4.2) More on SQL (Chapter 5) Example Instances We will use these instances of the Sailors and Reserves relations in our examples. If the key for the Reserves relation ...
Lecture 23: Multi-table SQL Queries (Joins) Using tables in HTML Goes in order with Examples at my site. Principles of Web Design 5th Edition Lesson 5: HTML Tables. Lecture 21: Multi-table SQL Queries (Joins) Presentation transcript:Lecture 16: SQL and HTML tables CSE 154 Lecture 16...
it joins is said to be dangling. –Similarly for a tuple of S. • Outerjoin preserves dangling tuples by padding them with a special NULL symbol in the result. 27 Example: Outerjoin R = ( A B ) S = ( B C ) 1 2 2 3 ...
More live examples Inner joins require an ON clause Like a where clause Arbitrary boolean expression If always true (1=1), reduces to cross join New compar op: BETWEEN a between 5 and 10 a >= 5 and a <= 10 Q: produce a list of employees with their salary ...
Comment out the other two joins one at a time and again compare results with the original query. Run the original query again because your result may have changed while you've been working. This is just a start but hopefully it will point you in the right direction, as Andras and others...
Improved Query Speed- processing optimizations supported by in-database analytics enable significantly better query performance. Actions which before required self-joins or complex procedural processing may now be performed in native SQL. Improved Manageability- ability to access a consolidated view of all...
SQL basics SELECT name FROM cities WHERE id = 17; SQL INSERT INTO countries VALUES ('SLD', 'ENG', 'T', 100.0); SQL Structured Query Language (SQL): a language for searching and updating a database a standard syntax that is used by all database software (with minor incompatibilities)...
1 Lecture 04: SQL Wednesday, January 11, Outline Two Examples Nulls (6.1.6) Outer joins (6.3.8) Database Modifications (6.5) 1 CS 430 Database Theory Winter 2005 Lecture 12: SQL DML - SELECT. Lectures 2&3: Introduction to SQL. Lecture 2: SQL Part I Lecture 2. ...