SQL PROGRAMMING STYLE- P13 doc

... 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