Chris Date - SQL and Relational Theory - Wellington

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C. J. Date is an independent author, lecturer, researcher, and consultant of international renown, specializing in relational database technology. He is best known for his book "An Introduction to Database Systems" (eighth edition, Addison-Wesley, 2004), which has sold some 850,000 copies and is used by several hundred colleges and universities worldwide. In this event, he will present "SQL and Relational Theory: How to Write Accurate SQL Code" where he shows you how to write SQL code that's logically correct; how to avoid various SQL traps and pitfalls; and, more generally, how to use SQL as if it were a true relational language. DURATION Abbreviated (two-day) version covering the topics. WHO SHOULD ATTEND · Database application designers and implementers · Information modelers and database designers · Data and database administrators · Computer science professors specializing in database matters · DBMS designers, implementers, and other vendor personnel · Database consultants · People responsible for DBMS product evaluation and acquisition The seminar is not meant for beginners: Attendees will be expected to have at least an elementary familiarity with database concepts in general and the SQL language in particular. Attendees will also be expected to attempt a number of pencil and paper exercises in class. Solutions to those exercises will be discussed in class as well. OBJECTIVES On completion of this seminar, attendees will: · Have a solid understanding of relational theory · Appreciate how relational principles provide SQL's logical underpinnings · Understand the breadth and depth of those principles · Know how to formulate complex SQL code with confidence that it's correct · Generally, be able to use SQL relationally DOCUMENTATION Attendees will receive a workbook containing copies of the speaker's slides. TOPIC OUTLINE 1. Setting the scene Codd’s relational model SQL terminology vs. relational terminology Model vs. implementation Properties of relations Base vs. derived relations Relations vs. relvars The Third Manifesto and Tutorial D Wittgenstein’s dictum 2. Types and domains Domains are types Types and operators System vs. user defined types Scalar vs. nonscalar types Scalar types in SQL SQL type checking and coercion “Possibly nondeterministic” expressions SQL row and table types 3. Tuples and relations, rows and tables What’s a tuple? Rows in SQL What’s a relation? Relations are n-dimensional Relational comparisons TABLE_DUM and TABLE_DEE Tables in SQL A column naming discipline 4. No duplicates, no nulls What’s wrong with duplicates? Avoiding duplicates in SQL What’s wrong with nulls? Avoiding nulls in SQL A remark on outer join Implications and ramifications 5. Base relvars, base tables Data definition Updating is set level Relational assignment D_INSERT, I_DELETE, and other shorthands Candidate and foreign keys Predicates and propositions The Closed World Assumption 6. SQL and relational algebra I: The original operators Importance of closure Relation type inference rules Attribute renaming Restriction, projection, join Union, intersection, difference Primitive operators WITH and complex expressions What expressions mean Evaluating SQL expressions Expression optimization 7. SQL and relational algebra II: Additional operators Exclusive union Semijoin and semidifference Extend Image relations Divide Aggregation and summarization Relation valued attributes “What if” queries What about ORDER BY? Recursive queries 8. SQL and constraints Type constraints Type constraints in SQL Database constraints Database constraints in SQL The role of transactions Immediate vs. deferred checking Multiple assignment Constraints vs. predicates The Golden Rule Correctness vs. consistency 9. SQL and views Views are relvars The Principle of Interchangeability Views and predicates Retrieval operations Views and constraints Updating operations What are views really for? Views and snapshots 10. SQL and logic I: Relational calculus Natural language is often ambiguous Propositions and predicates Connectives Truth functional completeness Quantification: EXISTS, FORALL, UNIQUE Range variables and correlation names Calculus expressions Queries and constraints SQL support Transforming expressions Relational completeness 11. SQL and logic II: Using logic to write SQL code Important identities SQL and implication SQL and FORALL Correlated subqueries Naming subexpressions Dealing with ambiguity Using COUNT ALL or ANY comparisons GROUP BY and HAVING 12. Further SQL topics Explicit tables Dot qualification Range variables Table, row, and scalar subqueries “Possibly nondeterministic” expressions Empty set issues A BNF grammar for SQL 13. The relational model Why databases must be relational Theory is practical The relational model defined What a database really is The relational model vs. others Essentiality What remains to be done? The future of SQL 14. A relational approach to missing information Preliminaries Vertical and horizontal decomposition Varieties of missing information Constraints and queries “Don’t know” answers The Principle of Orthogonal Design Remarks on physical design MORE INFORMATION Click here for more information on C.J. Date or this presentation. REGISTRATION

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