SQL PROGRAMMING STYLE- P30 pps

... and then “Obtaining Permissions.” Library of Congress Cataloging-in-Publication Data Application submitted. ISBN: 0-1 2-0 8879 7-5 For information on all Morgan Kaufmann publications, visit our ... types: in SQL Server, DATETIME (their name for TIMESTAMP data type) is a binary number internally (UNIX -style system clock representation), but TIMESTAMP is a string of digits in DB2...

Ngày tải lên: 10/04/2014, 09:40

... referring to events such as SQL Server Agent job failure, or an abnormal SQL Server performance condition, or excessive resource (e.g. disk space) utilization, or SQL Services availability. ... problem. Service availability It should go without saying that a SQL service, such as SQL Server service (the database engine) or SQL Server Agent service, stopping is an even...

Ngày tải lên: 04/07/2014, 23:20

... pane. Once it’s verifi ed, click New and fi nally click Finish. To create or modify existing distribution groups via the EMS, use the New-DistributionGroup and Set-DistributionGroup CMDlets. ... Exchange 2007 NOTE As already mentioned, the only difference between mail-enabled distribution groups and mail-enabled security groups is the ability for security groups to be used to assign pe...

Ngày tải lên: 06/07/2014, 13:20

Ngày tải lên: 06/07/2014, 23:20

... tables, 63 SQL 4GLs, 151, 152 bad programming in, 184–89 as declarative language, 193 Dynamic, 168–70 injection, 169–70 Standard, 4, 5, 6, 7, 118 testing, 130–31 thinking in, 183–95 SQL- 92 CASE ... 3 quoted identifiers, 5 string operators, 108 SQL- 99, 3 Stamp coupling, 156 Standard functions, 108 Standard Industrial Classification (SIC), 14 Standard SQL case-sensitivity rules, 6, 7...

Ngày tải lên: 06/07/2014, 23:20

... system, 89–90 Display, 96 Domain-Key Normal Form (DKNF), 62–63 DROP TABLE statement, 67 Dynamic SQL, 168–70 purpose, 168 in stored procedures, 169 E Electronic data interchange (EDI) files,

Ngày tải lên: 06/07/2014, 23:20

... full SQL- 92 you could write a constraint like this: CHECK (NOT EXISTS (SELECT store_nbr FROM JobAssignments WHERE job_type = 99)) GROUP BY store_nbr HAVING COUNT(*) > 1)) But many SQL ... code. Despite the SQL/ PSM and other standards, most vendors implement different trigger models and use their proprietary 4GL language, but, being a fanatic, I want a pure SQL solution....

Ngày tải lên: 06/07/2014, 23:20

... particular SQL products that can suggest indexes based on the actual statements submitted to the SQL engine. Consider using one. 6.9 Avoid Correlated Subqueries Rationale: In the early days of SQL, ... is a SQL/ PSM standard, in the real world, only Mimer and IBM have implemented it at the time of this writing. Instead, each vendor has a proprietary 4GL, such as T -SQL for the Syba...

Ngày tải lên: 06/07/2014, 23:20

... and Centura (née Gupta) lets you pick which one to use—the worst of both nonstandard worlds! In SQL- 92, you have a choice and can force the order of execution. Either do the predicates after

Ngày tải lên: 06/07/2014, 23:20

... will need for your smallest units . In most SQL implementations, rounding and truncation will improve with more decimal places. The downside of SQL is that precision and the rules for truncation ... that only the allowed values appear in the database . If you have the CREATE DOMAIN feature of SQL- 92, use it to build your scales. Nominal scales would have a list of possible val...

Ngày tải lên: 06/07/2014, 23:20

... database often does not give the user a choice of precision for many calculations. In fact, the SQL standards leave the number of decimal places in the results of many arithmetic operations to

Ngày tải lên: 06/07/2014, 23:20

... then they are both free to do so. The values have be recorded in the most general data type in the SQL engine, so you use a lot of VARCHAR(n) columns in the EAV model. Now try to put a constraint ... thought about the best way to represent their data. Although this topic is not specifically about SQL style, it gives a foundation for decisions that have to be made in the design of any...

Ngày tải lên: 06/07/2014, 23:20

... the present time might excuse the use of proprietary data types. In 20 years of consulting on SQL programming, I have never found a situation that could not be handled by a basic data type or ... another of the same product. Standard SQL has more than enough data types to model most of the things you will find in the real world. As an example, only the SQL Server/Sybase family has...

Ngày tải lên: 06/07/2014, 23:20

... There was also a series of articles at: http://www.sqlservercentral.com/columnists/sjones/ codingstandardspart2formatting.asp http://www.sqlservercentral.com/columnists/sjones/ codingstandardspart1formatting.asp ... will see “usp_” for user-defined stored procedures, “trig_” for triggers, and so forth. In MS SQL Server, this is a serious problem, because the prefix “sp_” is used for s...

Ngày tải lên: 06/07/2014, 23:20

... Elements 1.2.1 ISO-11179 for SQL Rationale: Although the formal standards are good, they are very general. It is handy to have a set of rules aimed at the SQL developer in his or her own ... declarations. The strangest version of this is a rule on a Web site for a company that specializes in Oracle programming. It advocated “<table name>_CK_<column name>” for CHECK...

Ngày tải lên: 06/07/2014, 23:20