FOR-LOOP

While the number of iterations through a WHILE loop is unknown till the loop completes, then the number of iterations through a FOR loop is known before the loop is entered. The FOR loops iterate over a particular range of integers. The range is the part of an iteration scheme that is enclosed by the keywords FOR and LOOPS. A double dot (..) serve as the range operator. The syntax is as shown below:

FOR counter IN [REVERSE] lower_bound..higher_bound LOOP
sequence_of_statements
END LOOP;


The range is computed when the FOR loop is first entered and is never re-evaluated.



As the next illustration shows, the series of statements is executed once for each integer in the range. After each of the iteration, the loop counter is incremented.

FOR i IN 1..3 LOOP -- assign the values 1,2,3 to i
sequence_of_statements -- executes three times
END LOOP;


The following illustration shows that if the lower bound equals the higher bound, the series of the statements is executed once:

FOR i IN 3..3 LOOP -- assign the value 3 to i
sequence_of_statements -- executes one time
END LOOP;

Posted Date: 10/3/2012 5:57:10 AM | Location : United States

Ask an Expert

Related Discussions:- For-loop -iterative control, Assignment Help, Ask Question on For-loop -iterative control, Get Answer, Expert's Help, For-loop -iterative control Discussions

Write discussion on For-loop -iterative control
Your posts are moderated

Write your message here..

Related Questions

Query, ALTER TABLE bb_basketitem ADD CONSTRAINT bitems_qty_ck CHECK (quan... ALTER TABLE bb_basketitem ADD CONSTRAINT bitems_qty_ck CHECK (quantity BEGIN INSERT INTO bb_basketitem VALUES (88,8,10.8,21,16,2,3); END; Brewbean’s wants to add a check

Introduction to SQl and DQL, which operation is used if we are interested i... which operation is used if we are interested in only certain columns of a table?

Create a sql database, The requirements as follows: Create a folder call... The requirements as follows: Create a folder called "SECURITY" on the server and upload all your project files to that folder. Please note, the "SECURITY" folder is NOT to be IN

Relational schema, query to Find the account numbers of all customers whose... query to Find the account numbers of all customers whose balance is more than 10,000 $

Restriction and and - sql, Restriction and AND - SQL Restriction is av... Restriction and AND - SQL Restriction is available via the WHERE operator, and so it is in SQL. However, by Example showing how a certain simple restriction can be expressed u

Parameter & keyword description-execute immediate statement, Parameter and ... Parameter and Keyword Description: dynamic_string: This is a string variable, literal, or expression which represents a SQL statement or the PL/SQL block. define_vari

Keys in sql, Keys in SQL SQL support for keys in the following respect... Keys in SQL SQL support for keys in the following respects: SQL does not require at least one key for every base table. If no key is explicitly declared, then KEY {ALL B

What are decision support systems, (a) What are decision support systems, a... (a) What are decision support systems, and what role do they play in the business environment? (b) Data warehousing is defined as "a subject-oriented, integrated, non-volatile c

Parameter and keyword description - exit statement, Parameter and Keyword D... Parameter and Keyword Description: EXIT: An unconditional EXIT statement (i.e., one without a WHEN clause) exits the present loop instantly. The Execution resumes with th

Use native dynamic sql - improve performance of application, Use Native Dyn... Use Native Dynamic SQL A few programs (a normal-purpose report writer for illustration) should build and process a variety of SQL statements at run time. Therefore, their full