SQL PROGRAMMING STYLE- P15 pot

... but rather as a tool for doing short tasks inside a SQL Server database. At the other extreme, Oracle’s PL /SQL is modeled after ADA and SQL/ PSM. It is a complicated language that can be used ... tables and columns, combining tables, and splitting tables. In general, if you follow good SQL/ SQL programming practices, you will usually not encounter situations where the usage of VIEW...

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

... procedural programming! SQL will not make up for a lack of programming skills. In fact, the bad effects of mimicking 3GL languages in SQL are magnified. The optimizers and compilers in SQL engines ... reasoning. 10.1 Bad Programming in SQL and Procedural Languages As an example of not learning any relational approaches to a problem, consider a posting in the comp.databases...

Ngày tải lên: 06/07/2014, 23:20

... almost write itself. 9.2 Add the Words “Set of All…” in Front of the Nouns The big leap in SQL programming is thinking in sets and not in process steps that handle one unit of data at a time. ... still get multiple couples on the dance floor. This is where some experience with SQL helps. One of the customary programming tricks is to use a self-join to get a ranking of elements...

Ngày tải lên: 06/07/2014, 23:20

... them has seen! VIEWs are virtual tables, defined by SELECT statements stored in the database. The SQL statement that defines the VIEW is executed only when the VIEW is invoked in another statement.

Ngày tải lên: 06/07/2014, 23:20

... standards. Standard SQL defines a minimal set of simple temporal math operators. All of them are available in all SQL products, but the syntax varies. For example, in the T -SQL dialect, the function ... architecture. This is a basic programming principle and has nothing to do with SQL per se. Failure to follow this principle is usually the result of a newbie who came to SQL f...

Ngày tải lên: 06/07/2014, 23:20

... help with this concept from the X/Open SQL Portability Guides. A major problem in becoming a SQL programmer is that people do not unlearn procedural or OO programming they had to learn for their ... language. Another problem in becoming a SQL programmer is that people tend to become SQL dialect programmers and think that their particular product’s SQL is some kind of standard....

Ngày tải lên: 06/07/2014, 23:20

... at the time. Before you say that the NULL in SQL is a quick solution to this problem, think about how NULL is ignored in many SQL functions. The SQL query “SELECT tag_nbr, SUM(fine) FROM tickets ... allow for the change from the old ZIP codes to the current ZIP+4 codes in their address data. SQL does not have this as a physical problem, but it can show up as a logical problem. Ano...

Ngày tải lên: 06/07/2014, 23:20

... in a way that avoided redundant data in too many files and not have it depend on a particular programming language. A file is made up of records, and records are made up of fields. A file is ... to read a FORTRAN file with a COBOL program? A database is language independent; the internal SQL data types are converted into host language data types. A field exists only because of the ....

Ngày tải lên: 06/07/2014, 23:20

... programmers. My goals in this book are to improve SQL programming style and proficiency. To be more exact: 1. To help an individual programmer write Standard SQL without an accent or a dialect . ... other SQLs, cannot be easily understood by an end user, and cannot be expanded. In the second case, what some newbies, who are still thinking in terms of second- and third-generati...

Ngày tải lên: 10/04/2014, 09:40