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Question: Difference between an implicit & an explicit cursor.

Answer: PL/SQL declares a cursor implicitly for all SQL data manipulation statements, including quries that return only one row. However,queries that return more than one row you must declare an explicit cursor or use a cursor FOR loop. Explicit cursor is a cursor in which the cursor name is explicitly assigned to a SELECT statement via the CURSOR...IS statement. An implicit cursor is used for all SQL
statements Declare, Open, Fetch, Close. An explicit cursors are used to process multirow SELECT statements An implicit cursor is used to process INSERT, UPDATE, DELETE and single row SELECT. .INTO statements.



Category SQL In Oracle Interview Questions & Answers - Exam Mode / Learning Mode
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Question: Difference between an implicit & an explicit cursor.
Answer:

PL/SQL declares a cursor implicitly for all SQL data manipulation statements, including quries that return only one row. However,queries that return more than one row you must declare an explicit cursor or use a cursor FOR loop. Explicit cursor is a cursor in which the cursor name is explicitly assigned to a SELECT statement via the CURSOR...IS statement. An implicit cursor is used for all SQL
statements Declare, Open, Fetch, Close. An explicit cursors are used to process multirow SELECT statements An implicit cursor is used to process INSERT, UPDATE, DELETE and single row SELECT. .INTO statements. Source: CoolInterview.com


The implicit cursor is used to process INSERT, UPDATE,
DELETE, and SELECT INTO statements. During the processing of
an implicit cursor,Oracle automatically performs the OPEN,
FETCH, and CLOSE operations.

Where as in explicit cursors,the process of its working is
done in 4 steps namely DECLARE a cursor,OPEN a cursor,
FETCH from cursor and CLOSE a
cursor.

IMPLICT CURSOR:- Automatically porvide by oracle which
perform DML statements. queries returns only one row.

EXPLICT CURSOR:- Defined by user. queries returns more
than rows.

Explicit Cursor:-We are not able to Handle NO_DATA_FOUND
Exception.

Implicit Cursor:-We are able to Handle NO_DATA_FOUND
Exception.
Source: CoolInterview.com

Answered by: ranjit kumar martha | Date: 8/21/2008 | Contact ranjit kumar martha Contact ranjit kumar martha

According to pl/sql where the data is temporarily stored is called cursor.
The Implicit cursor is created by Oracle engine itself while Explicit cursor is created by programmer by mean of programming statement.
The Exception can be handled in the Implicit cursor whereas Explicit cursor is unable to handle Exceptions.
There are properties of cursor
%open - check cursor is open or not.
%found - Row found out or not.
%not found - yes if no row found.
%row count - Rows affected by statement.
There are 4 steps of working of cursor named DECLARE-cursor is declared, OPEN- cursor is opened, FETCH- data fetched, CLOSE- close the cursor. Source: CoolInterview.com

Answered by: Shaikh Rehana | Date: 2/2/2010 | Contact Shaikh Rehana Contact Shaikh Rehana


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