Joe Celko s SQL for Smarties - Advanced SQL Programming P49 pps

... Joe Celko s SQL for Smarties: Advanced SQL Programming, second edition; Joe Celko s SQL Puzzles and Answers; and Joe Celko s Trees and Hierarchies in SQL for Smarties. INDEX 803 Subsets, ... Intelli- gent Enterprise magazine (which won several Reader s Choice Awards), and the war stories he tells to provide real-world insights into SQL programming. H...

Ngày tải lên: 06/07/2014, 09:20

... Kaufmann Series in Data Management Systems Series Editor: Jim Gray, Microsoft Research • Joe Celko s SQL for Smarties: Advanced SQL Programming , Third Edition, Joe Celko • Moving Objects ... Techniques with Java Implementations , Ian Witten and Eibe Frank • Joe Celko s SQL for Smarties: Advanced SQL Programming , Second Edition, Joe Celko •...

Ngày tải lên: 06/07/2014, 09:20

... Statistics 537 23.7 Cross Tabulations 538 23.7.1 Crosstabs by Cross Join 542 23.7.2 Crosstabs by Outer Joins 543 23.7.3 Crosstabs by Subquery 544 23.7.4 Crosstabs by CASE Expression 545 23.8 Harmonic ... Multivariable Descriptive Statistics in SQL 546 23.9.1 Covariance 546 23.9.2 Pearson s r 547 23.9.3 NULLs in Multivariable Descriptive Statistics 548 24 Regions, Runs, Gaps, Sequences,...

Ngày tải lên: 06/07/2014, 09:20

... useful work. In fact, the U .S. Government described the SQL- 99 standard as “a standard in progress” and required SQL- 92 conformance for federal contracts. The reason for the loyalty to SQL- 92 ... and Advanced Database Topics 770 Books on SQL- 92 and SQL- 99 771 Standards and Related Groups 771 Web Sites Related to SQL 772 Statistics 772 Temporal Databases 773 New Citations...

Ngày tải lên: 06/07/2014, 09:20

... almost no two SQL products use the same internal structures. SQL Server uses physically contiguous storage accessed by two kinds of indexes; Teradata uses hashing; Nucleus (SAND Technology) uses ... statement is in Standard SQL; it existed in most SQL products before it was standardized. It is still implemented in many different ways, so you should see your product for details. Ag...

Ngày tải lên: 06/07/2014, 09:20

... insert rows like this: (&apos ;Joe Celko& apos;, 'Hilary Duff') (&apos ;Joe Celko& apos;, 'Lindsay Lohan') ('Toby McGuire', 'Lindsay Lohan') (&apos ;Joe Celko& apos;, ... a smart optimizer will spot. I leave same-sex marriages as an exercise for the reader. The Couples table allows us to insert these rows from the original set. (&apos ;Joe C...

Ngày tải lên: 06/07/2014, 09:20

... is usually something like this. CREATE ASSERTION Nobody_Unassigned CHECK (NOT EXISTS (SELECT * FROM Personnel AS P LEFT OUTER JOIN JobAssignments AS J ON P.ssn = J.ssn WHERE J.ssn IS ... schedule: ('Mr. Celko& apos;, 'Database 101', 222, 6) ('Mr. Celko& apos;, 'Database 102', 223, 6) ('Ms. Shields', 'Database 101', 223, 6) Ms. ......

Ngày tải lên: 06/07/2014, 09:20

... constraint ensures that anything not aimed at a known person is classified as an individual subscription. Attribute Split Rows Consider this table, which directly models a sign-in/sign-out sheet. ... Use a few statements such as: INSERT INTO Foobar (a, b, c) VALUES ('a1', 'b1', 'c1'); INSERT INTO Foobar (a, b, c) VALUES ('a2', 'b2', 'c...

Ngày tải lên: 06/07/2014, 09:20

... Numbers for Keys 45 INSERT INTO FormsControl (form_nbr, seq, VALUES (‘Flob-1/R’, (SELECT MAX(seq)+1 FROM FormsControl WHERE form_nbr = ‘Flob-1/R’), ); You can also use views on the FormsControl ... the GUID does not have any sorting sequence, so it is impossible to spot a missing value or use them to order results. All you can do is use a CHECK() with a regular expression for...

Ngày tải lên: 06/07/2014, 09:20

... BY clause is part of a cursor, not part of a SELECT statement. Because some SQL products, such as SQL Server and Sybase, allow the user to create implicit cursors, many newbies get this wrong. ... Use a CURSOR The best performance improvement technique for cursors inside the database is not to use them. SQL engines are designed for set processing, and they work better with se...

Ngày tải lên: 06/07/2014, 09:20