Answer / ganesh

cursor is a small work area like memory which are given by
oracle to execute sql statement, after execution this space
are made free for another sql staments to execute.

when we use the cursor with cursor name for a tble,then
that cursor will bring those from database one by one and
will keep in cursor memory for execution.

Answer / s.syam sundar

oracle uses a private area to process and store data.this
private area is called as cursor

we have two types of cursors
they are implict and explict
implict cursor:- it is a cursor which controlled by oracle
itself
Ex: select statmets,insert,update and delete statmets

explict cursors:- it is a cursor which controlled by
programmer

controlling means
open cursor
fetch into
close cursor

Ex: create cursor c1(cursor name) as select * from emp
where deptno =10;( this is in declarative section)


in excutable section:
open cursor c1;
fetch cursor c1 into some veriable or table name;
......
.....
close c1

we can use parameters in cursors

and we can not assiagn cursor name to a variable

and we need not use cursor statemets in for update cursor
because it will take care of

regards
S.syam sundar

Answer / t.r.sekhar

cursor is a temporary buffer used to hold the transactional
data for the manipulation purpose.
data will not permanently stored in database.
it is not reusable.

syntax:
cursor <cursor name> is <select stmt);
we have two types of cursors are there.
1.implicit cursors-automatically created whenever dml
statements are executed.
2.explicit cursors-created by user

Answer / suriya

Cursor is a mechanism by which we can name a 'select
stataments' and manipulate the information within that.
They are very useful, when we need to run a particular SQL
repeatedly.
Cursors are of 2 types, Implicit and Explicit.
Implicit Cursors: All the select statements we run are
implicitly stored in a cursor, by default. They are defined
by oracle.
Explicit Cursors: This is like user defined cursor. The
user can declare and use a cursor of his own requirement.
The operations performed with a cursor are declaring,
opening,fetching and closing.
Note:Leaving a cursor unclosed, will cause error.

Answer / kishor

Cursor is a pointer to the context area where data is
stored and fetched row by row.

Answer / gourvendra singh

A Cursor is a handle (a name or pointer) for the memory
associated with a specific statement. It is of two type
Implicit and explicit, we usually create explicit cursor
for our sql statements, we can also save them by providing
them a name.

Answer / nageswara rao

cursor acts as datatype for holding composite
variable.composite variable hold more than one value at a
time.

when ever u declare a cursor it tells to sqlserver that
memory is create for that cursor
whenever u open the cursor it executes select statement in
declare section and reserves memory stored the result of
execution in this memory.and reserves pointer to the before
first

Answer / s.syam sundar

oracle uses a private area to process and store data.this
private area is called as cursor

we have two types of cursors
they are implict and explict
implict cursor:- it is a cursor which controlled by oracle
itself
Ex: select statmets,insert,update and delete statmets

explict cursors:- it is a cursor which controlled by
programmer

controlling means
open cursor
fetch into
close cursor

Ex: cursor c1(cursor name) is select * from emp
where deptno =10;( this is in declarative section)


in excutable section:
open cursor c1;
fetch cursor c1 into some veriable or table name;
......
.....
close c1

we can use parameters in cursors

and we can not assiagn cursor name to a variable

and we need not use cursor statemets in for update cursor
because it will take care of

regards
S.syam sundar

Answer / guest

returns multiple tuples from a table

What are the pre requisites?

1 Answers  

TABLE A TABLE B EMPNO ENAME EMPNO ENAME 1 A 1 A 2 B 2 B 3 C 3 C 4 D 4 D 5 E 5 E 6 F 7 G HOW TO GET THE UNMATCHED RECORDS IN SQL QUERY?

10 Answers   Satyam,

Write the order of precedence for validation of a column in a table? I. Done using database triggers. Ii. Done using integarity constraints

0 Answers  

What are the Restrictions on Cursor Variables?

2 Answers  

Create table emp (id number(9), name varchar2(20),salary number(9,2)); The table has 100 records after table created.Now i nee to change id's Datatype is to be Varchar2(15). now Alter table emp modify(id varchar2(15),name varchar2(20), salary number(9,2)); Whether it will work or returns error? post answer with explanation.

13 Answers   Oracle, TCS,

What is the basic structure of an sql?

0 Answers  

what is an index? : Sql dba

0 Answers  

What can you do with pl sql?

0 Answers  

What is an example of translating a date into julian format?

0 Answers  

What program will open a mdb file?

0 Answers  

What is data control language?

0 Answers  

What is bitemporal narrowing?

0 Answers