What are cursor?where are they used?
Answers were Sorted based on User's Feedback
Answer / sohini
Whenever you issue a SQL statement, the Oracle server opens
a SQL work area in memory in which the command is parsed
and executed. This area is called a cursor.There are two
type of cursors:
Implicit Cursor:PL/SQL declares a cursor implicitly for all
SQL data manipulation statements, including queries that
return only one row.PL/SQL manages this cursorautomatically.
Explicit Cursor:The programmer explicitly declares and
names an explicit cursor for queries that return more than
one row.it is managed by the programmer.
Explicit cursors are used when one wants to do some
processing with a set of rows fetched from a table or
multiple table.They are managed using OPEN,FETCH and CLOSE.
4 attributes are used in both types of cursors:%FOUND,%
NOTFOUND,%ROWCOUNT and %ISOPEN.
Is This Answer Correct ? | 7 Yes | 1 No |
Answer / manvendra
USER DEFINED sql WORK AREA FOR QUERY IS CURSOR.
USED TO STORE RESULT SET PROVIDED BY THE QUERY FOR SHORT
AND TEMP BASIS.
MAIN STATES ARE
CLOSE
OPEN
FETCH
Is This Answer Correct ? | 0 Yes | 1 No |
What are the uses of synonyms?
What are the different approaches used by Optimizer in choosing an execution plan ?
What is an anonymous block?
What is a database table in oracle?
How to define a specific record type?
How to view existing locks on the database?
SELECT THE RECORDS FROM 3 TABLES LIKE(T1,T2,T3) AND HOW CAN WE INSERT THAT RECORD IN ANOTHER TABLE LIKE(T4)?
Name the various constraints used in oracle?
Respected sir, Please send me technical questions related to oracle apps..
How to delete a column in an existing table?
What is Undo Management Advisor in Oracle?
What is a recycle bin in oracle?