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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;
Explicit Cursor Attributes The cursor variable or each cursor has four attributes: %FOUND, %ISOPEN, %ROWCOUNT, and %NOTFOUND. When appended to the cursor or cursor variable, th
TYPES OF EVOLUTION - Sequential evolution : Minor changes in the gene pool of a population from one generation to the next, with the resul
#quesWrite a cursor to open an employee database and fetch the employee record whose age is greater than 45.tion..
set serveroutput on declare a number(5); b number(5); c number(5); begin a:=&a; b:=&b; c:=a/b; dbms_output.put_line(c); exception when zero_divide then d
Aggregate Operators SQL Supports all of the aggregate operators mentioned in the theory book and many more besides. The syntax, however, involves an unusual trick that SQL cal
Managing Cursors The PL/SQL uses 2 types of cursors: implicit and explicit. The PL/SQL declares a cursor implicitly for all the SQL data manipulation statements, including th
Identifiers You use identifiers to name the PL/SQL program items and units that include constants, variables, cursors, exceptions, cursor variables, subprograms, and packages.
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Left and Right Joins LEFT OUTER JOIN can be used when you want to retrieve the data from the main table (table1) even if there is no match in other tables (table_2, table_3...
Collection Methods: The collection method is a built-in function or procedure which operates on the collections and is called using the dot notation. The methods like the C
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