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FOR-LOOPWhile 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 LOOPsequence_of_statementsEND 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 isequence_of_statements -- executes three timesEND 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 isequence_of_statements -- executes one timeEND LOOP;
Type versus Representation Confusion in SQL This describes how a value might have two or more distinct representations. For example, user-defined type POINT might have a decla
Fetching from a Cursor Variable The FETCH statement retrieve rows one at a time from the product set of a multi-row query. The syntax for the same is as shown: FETCH {curso
IN Mode An IN parameter pass the values to the subprogram being called. Within the subprogram, an IN parameter acts like a constant. And hence, it cannot be assigned a value.
Character Types The Character types allow you to store alphanumeric data, represent words and text, and manipulate the character strings. CHAR You use the CHAR dataty
i NEED THE QURIES TO SOME OF THE PROBLEMS USING plsql
Project Description: I want a database for large governmental and private data sets on one country that will be easily extended to other countries in the future. Also, the datab
Substitution and Instantiation - SQL It shows how NULL might appear in substitution for a parameter of a predicate and how it might thus participate in instantiation of that p
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Declaring Objects: You can use the object types wherever built-in types like CHAR or NUMBER can be used. In the block below, you can declare object r of type Rational. Then, yo
Parameter and Keyword Description: label_name: This is an undeclared identifier which optionally labels a loop. When used, the label_name should be enclosed by double ang
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