What does the usage of CURSOR word mean in an SQL statement?

Hey folks,
Please check out the following query and do please explain me what does the usage of CURSOR keyword in an SQL statement mean.
select deptno,cursor(select ename from emp a where a.deptno=b.deptno) from dept b;
well, the output was like this,
DEPTNO CURSOR(SELECTENAMEFR
10 CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
ENAME
CLARK
KING
20 CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
ENAME
SMITH
JONES
SCOTT
ADAMS
FORD
30 CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
ENAME
ALLEN
WARD
MARTIN
BLAKE
TURNER
JAMES
6 rows selected.
40 CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
no rows selected
Your favour'll be deeply appreciated.
Cheers,
PCZ

This returns a non-square result set. Each row of the result is a deptno and then a result set of the enames in that deptno.
This can be useful when you need to send a lot of data to a client application in a single query that would otherwise contain a lot of redundancy. It tends to be a relatively unusual construct (I've only found one situation where it was appropriate in my career) and requires some relatively sophisticated understanding on both the database and client sides.
Justin

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What does the usage of CURSOR word mean in an SQL statement?

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