SQL PROGRAMMING STYLE- P37 doc

... follows: Java Java Programming Style Guidelines Version 3.5, January 2004 Geotechnical Software Services Copyright © 1998-2004 This document is available at http://geosoft.no/javastyle.html ... von 1 3Java Programming Style Guidelines 18.02.2004http://geosoft.no/javastyle.html 7 References [1] Code Complete, Steve McConnel - Microsoft Press [2] Java Code Conventions...

Ngày tải lên: 19/01/2014, 16:20

... specifications were never explained beyond that. He posted a pseudocode program in T -SQL dialect, which would translate into Standard SQL pseudocode something like this: CREATE PROCEDURE TapeFileRoutine() BEGIN ... overwhelming reason is ignorance of SQL and old habits. The cursors in SQL are modeled after tape file semantics, and people know that kind of procedural programmin...

Ngày tải lên: 06/07/2014, 23:20

... predicates or CASE expressions. As an example of a horrible misuse of SQL, Chris White posted a procedure that built dynamic SQL that would then build a report. Aside from the obvious violations ... what you actually want. The other set operations in SQL- 92, EXCEPT [ALL], and INTERSECT [ALL] are not widely available yet. 6.11 Testing SQL When you are first writing a schema, you wi...

Ngày tải lên: 06/07/2014, 23:20

... score means and why it is incremented. In Standard SQL, a comment begins with two dashes ( ) and ends with a new line, because the first SQL engines were on IBM mainframes and used punchcards. ... brackets. They are a better choice. SQL programmers do not like to put comments in their code, not even redundant or useless ones. My guess is that because SQL does a lot of work in one...

Ngày tải lên: 06/07/2014, 23:20

... 6.2.3 Avoid Redundant Expressions Rationale: Most modern SQL engines are pretty smart. This was not always the case, so older SQL programmers will sometimes add redundant predicates to a ... OR-ed predicates Rationale: The IN() predicate was first introduced in the Pascal programming language. In SQL it has two forms; the list and the subquery. The list form has a comma-separa...

Ngày tải lên: 06/07/2014, 23:20

... passes. The most common use of concatenation codes is in keyword lists in the header records of documents in textbases. The author or librarian assigns each article in the system a list of keywords

Ngày tải lên: 06/07/2014, 23:20

... really fast on the current release of my SQL software? A1: Sure, if I want to lose all of the advantages of an abstract data model, SQL set-oriented programming, carry extra data, and destroy ... faster and easy to program. A2: This is an implementation problem that the SQL engine can handle. For example, Teradata is a SQL designed for very large database (VLDB) applications that...

Ngày tải lên: 06/07/2014, 23:20

... the actual problem. Exceptions: If your SQL product supports the SIMILAR TO predicate (a version of grep() based on the POSIX standard in Standard SQL) , then you might consider having a longer ... Table Declaration Rationale: These constraints are not yet well supported in SQL products, but they are legal SQL- 92 syntax. Their predicates involve the entire table as a whole...

Ngày tải lên: 06/07/2014, 23:20

... FONTS, PUNCTUATION, AND SPACING 2.8 Indentation When you have to indent in block-structured 3GL programming languages, use three spaces. A single space is too short to be read as anything but ... mechanical reasons. That became the definition when we moved to electronic terminals. The rule for SQL is that rivers override what we were doing in the old 3GL languages. Rationale:...

Ngày tải lên: 06/07/2014, 23:20

... and so forth. SQL Server and Sybase used different fixes for this problem in later versions of their products. Sybase did a hidden “SELECT DISTINCT” in the implied query, and SQL Server gets ... Standard SQL is consistent and clear about aliases, views, and derived tables, as well as a highly orthogonal language. If the UPDATE clause could take an alias, according to the Standard SQ...

Ngày tải lên: 06/07/2014, 23:20

... SECTION | SELECT | SESSION | SESSION_USER | SET | SIZE | SMALLINT | SOME | SPACE | SQL | SQLCODE | SQLERROR | SQLSTATE | SUBSTRING | SUM | SYSTEM_USER | TABLE | TEMPORARY | THEN | TIME | TIMESTAMP ... have to wrap exceptionally long lines. This is not as big a problem in a concise language like SQL as it was in a verbose language like COBOL. 2.1 Typography and Code 29 | MATCH...

Ngày tải lên: 06/07/2014, 23:20

... Additionally, capitalization represents proper nouns—like the names of sets being modeled by tables in SQL in English, German, and other natural languages. This is the way that readers expect to see ... Not only are words seen as wholes, but they are also anticipated within each statement in the programming language. That is, if I see an “IF” token in Pascal or another member of the A...

Ngày tải lên: 06/07/2014, 23:20

... ignorance and object-oriented (OO) programming. In particular, OO programmers put “_id” on every primary key in every table and have problems understanding that SQL is a strongly typed language ... from table to table. As an example, consider this slightly cleaned- up piece of actual code from a SQL newsgroup: SELECT Incident.Type, IPC.DefendantType, Recommendation.Notes, Offence.S...

Ngày tải lên: 06/07/2014, 23:20

... of the most important SQL schema objects according to ISO and several popular SQL products. 6 CHAPTER 1: NAMES AND DATA ELEMENTS Will this work? According to the SQL standard, it should ... of Names Rationale: The SQL- 92 standards have a maximum identifier length of 18 characters. This length came from the older COBOL standards. These days, SQL implementations allow lo...

Ngày tải lên: 06/07/2014, 23:20

... “Super Ameba” 180 9.11 Use the Newsgroups and Internet 181 10 Thinking in SQL 183 10.1 Bad Programming in SQL and Procedural Languages 184 ... Procedural Code 161 8.5 Scalar versus Structured Parameters 167 8.6 Avoid Dynamic SQL 168 8.6.1 Performance 169 8.6.2 SQL Injection 169 9 Heuristics 171 9.1 Put the Specification into a Clear ... Procedures 151 8.1 Most SQL...

Ngày tải lên: 06/07/2014, 23:20