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I have a table which has thousand of records i want to
fetch only record num 100 to record num 200. Write a query
that satisfies this criteria.(Cant use any keys)
Anyone please reply ASAP!
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Answer Posted / om prakash yadav
Note= Before i given the query it is worng pleas ignopre it.
Thanks.
========================================
using cursors you can do>
CURSOR Crs_trs IS
SELECT empno, empname, sal, deptno from emp WHERE empno
between 100 and 200;
vr_empno.empno%type;
vr_empname.empname%type;
vr_sal.sal%type;
vr_deptno.deptno%type;
BEGIN
OPEN Crs_trs;
IF crs_trs%ISOPEN THEN
LOOP
FETCH Crs_trs INTO vr_empno, vr_empname, vr_sal, vr_deptno;
dbms_output.put_line('empno__'||vr_empno );
dbms_output.put_line('empname__'||vr_empname);
dbms_output.put_line('empsalary__'||vr_empsal );
dbms_output.put_line('empdeptno__'|| vr_deptno);
EXIT WHEN Crs_trs%NOTFOUND;
END IF;
END LOOP;
CLOSE Crs_trs;
END;
| Is This Answer Correct ? | 1 Yes | 9 No |
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SET is the ANSI standard for variable assignment, SELECT is not. SET can only assign one variable at a time, SELECT can make multiple assignments at once. If assigning from a query, SET can only assign a scalar value. If the query returns multiple values/rows then SET will raise an error. SELECT will assign one of the values to the variable and hide the fact that multiple values were returned (so you'd likely never know why something was going wrong elsewhere - have fun troubleshooting that one) When assigning from a query if there is no value returned then SET will assign NULL, where SELECT will not make the assignment at all (so the variable will not be changed from it's previous value) As far as speed differences - there are no direct differences between SET and SELECT. However SELECT's ability to make multiple assignments in one shot does give it a slight speed advantage over SET.
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